diff --git a/Jenkinsfile b/Jenkinsfile
index 4af83c7093dcd3d14879791c9719586c5a8fd404..9b54e186365a893f0450b5ada69204e5d02c4bcb 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -309,7 +309,7 @@ pipeline {
               script {
                 if (env.JOB_NAME == 'ufz/ogs/master') {
                   sh "hugo --ignoreCache --baseURL https://benchmarks.opengeosys.org"
-                  // sh ("node_modules/.bin/hugo-algolia --toml -s")
+                  sh ("node_modules/.bin/hugo-algolia --toml -s")
                 } else {
                   sh ("hugo --ignoreCache --baseURL " + env.JOB_URL + "Web/")
                 }
diff --git a/web/content/books/BMB-3-Cover.jpg b/web/content/books/BMB-3-Cover.jpg
deleted file mode 100644
index ac8f5160c7a54d550bb2ef1b0bf7f762124e73b4..0000000000000000000000000000000000000000
--- a/web/content/books/BMB-3-Cover.jpg
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:08e56b54156cee475275207bd91cbf8932a4bfd589978ce64745b16fde4bffa7
-size 199799
diff --git a/web/content/books/BMB-3-Cover.png b/web/content/books/BMB-3-Cover.png
new file mode 100644
index 0000000000000000000000000000000000000000..8caf5e957ecf2c9569067c3fc1c8282973f845bd
--- /dev/null
+++ b/web/content/books/BMB-3-Cover.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 898337
diff --git a/web/content/books/bmb-3.pandoc b/web/content/books/bmb-3.pandoc
index 98471358a5f183acfe223a27408269608eef94c6..d71061436ba6bde6bfb6b2e64c817845deb7cc22 100644
--- a/web/content/books/bmb-3.pandoc
+++ b/web/content/books/bmb-3.pandoc
@@ -5,7 +5,7 @@ date = 2018-03-05T16:27:48+01:00
 author = "Lars Bilke"
 
 book_type = "Book"
-book_cover = "BMB-3-Cover.jpg"
+book_cover = "BMB-3-Cover.png"
 
 +++
 
diff --git a/web/content/books/bmb-4.jpg b/web/content/books/bmb-4.jpg
deleted file mode 100644
index 0520ff3ccabaaba360af2665c657f8aa8c912ce3..0000000000000000000000000000000000000000
--- a/web/content/books/bmb-4.jpg
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
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-size 34057
diff --git a/web/content/books/bmb-4.pandoc b/web/content/books/bmb-4.pandoc
index ec9f55cccba1f2ca0a39b5251efccfa8a1695ae3..f1618700533be35269748483c960fe80089fff64 100644
--- a/web/content/books/bmb-4.pandoc
+++ b/web/content/books/bmb-4.pandoc
@@ -5,7 +5,7 @@ date = 2018-03-07T15:35:30+01:00
 author = "Lars Bilke"
 
 book_type = "Book"
-book_cover = "bmb-4.jpg"
+book_cover = "bmb-4.png"
 
 +++
 
diff --git a/web/content/books/bmb-4.png b/web/content/books/bmb-4.png
new file mode 100644
index 0000000000000000000000000000000000000000..bdc8698db1eab85517ca5ecccdfeb34f55f98dca
--- /dev/null
+++ b/web/content/books/bmb-4.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:105600c3cd0601d62d5ab60012ac803952fd693b3d9375988cb0772cbd681b7c
+size 53861
diff --git a/web/content/books/computational-geotechnics-i.jpg b/web/content/books/computational-geotechnics-i.jpg
deleted file mode 100644
index eaf8d83c587acbce06643fc55fe5b3f50d024540..0000000000000000000000000000000000000000
--- a/web/content/books/computational-geotechnics-i.jpg
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:a97e89724720f888832e8295b1bf5fb70342b071dbcc4a750f9bf49036155991
-size 10045
diff --git a/web/content/books/computational-geotechnics-i.pandoc b/web/content/books/computational-geotechnics-i.pandoc
index 6fe93c6ffcce5c80b687dc5616f17fbe159eb670..8621dce15ac9ed7a4753d482db2c5fbf83a4aaa9 100644
--- a/web/content/books/computational-geotechnics-i.pandoc
+++ b/web/content/books/computational-geotechnics-i.pandoc
@@ -5,7 +5,7 @@ date = 2018-03-07T15:27:05+01:00
 author = "Lars Bilke"
 
 book_type = "Tutorial"
-book_cover = "computational-geotechnics-i.jpg"
+book_cover = "computational-geotechnics-i.png"
 
 +++
 
diff --git a/web/content/books/computational-geotechnics-i.png b/web/content/books/computational-geotechnics-i.png
new file mode 100644
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--- /dev/null
+++ b/web/content/books/computational-geotechnics-i.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 57708
diff --git a/web/content/books/geoenergy-modeling-ii.jpg b/web/content/books/geoenergy-modeling-ii.jpg
deleted file mode 100644
index c95a67e0b241e4f1bc8d137725fab383080b6539..0000000000000000000000000000000000000000
--- a/web/content/books/geoenergy-modeling-ii.jpg
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:5a4337cf92aa94bb82b9919846d5c7946c09967153bf2de16edb4bdb8c5a258a
-size 32115
diff --git a/web/content/books/geoenergy-modeling-ii.pandoc b/web/content/books/geoenergy-modeling-ii.pandoc
index b1d1b122c20c03095264fe9818be50a183cb55ff..05308ac094e8204c6fda597c660952379791d8e4 100644
--- a/web/content/books/geoenergy-modeling-ii.pandoc
+++ b/web/content/books/geoenergy-modeling-ii.pandoc
@@ -5,7 +5,7 @@ date = 2018-03-07T14:59:32+01:00
 author = "Lars Bilke"
 
 book_type = "Tutorial"
-book_cover = "geoenergy-modeling-ii.jpg"
+book_cover = "geoenergy-modeling-ii.png"
 
 +++
 
diff --git a/web/content/books/geoenergy-modeling-ii.png b/web/content/books/geoenergy-modeling-ii.png
new file mode 100644
index 0000000000000000000000000000000000000000..8df16b99a24b0abf662ffd32099cfc348bbe8ea2
--- /dev/null
+++ b/web/content/books/geoenergy-modeling-ii.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 53074
diff --git a/web/content/books/geoenergy-modeling-iii.jpg b/web/content/books/geoenergy-modeling-iii.jpg
deleted file mode 100644
index 6534f6fac58976907bde2c5c63a47da5c7440fc2..0000000000000000000000000000000000000000
--- a/web/content/books/geoenergy-modeling-iii.jpg
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:013a07d423bd5ee97de1ed3ee58ed66524975a24e54ba56eb6c0edd2c3f5a337
-size 59536
diff --git a/web/content/books/geoenergy-modeling-iii.pandoc b/web/content/books/geoenergy-modeling-iii.pandoc
index 2237c7f81d83b2ae6679ac4c5a9e670fd8389913..7abe1b4a7c6de4b01cab7037e97f6ff48a8294da 100644
--- a/web/content/books/geoenergy-modeling-iii.pandoc
+++ b/web/content/books/geoenergy-modeling-iii.pandoc
@@ -5,7 +5,7 @@ date = 2018-03-07T15:13:52+01:00
 author = "Lars Bilke"
 
 book_type = "Tutorial"
-book_cover = "geoenergy-modeling-iii.jpg"
+book_cover = "geoenergy-modeling-iii.png"
 
 +++
 
diff --git a/web/content/books/geoenergy-modeling-iii.png b/web/content/books/geoenergy-modeling-iii.png
new file mode 100644
index 0000000000000000000000000000000000000000..6b3466387c9def1f34291a58281f778ab1794122
--- /dev/null
+++ b/web/content/books/geoenergy-modeling-iii.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
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+size 59045
diff --git a/web/content/books/models-of-thermochemical-heat-storage.jpg b/web/content/books/models-of-thermochemical-heat-storage.jpg
deleted file mode 100644
index 61a2c08fcfe52ab382111b34778282c950a74576..0000000000000000000000000000000000000000
--- a/web/content/books/models-of-thermochemical-heat-storage.jpg
+++ /dev/null
@@ -1,3 +0,0 @@
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