[web] Adapted docs for new Conan behavior.

web/content/docs/devguide/advanced/conan-package-manager.pandoc

@@ -15,11 +15,11 @@ weight = 1032
 As of OpenGeoSys 6.1.0 Conan version 1.0.0 is required! Please update Conan by running `pip install --upgrade conan` or by downloading the Windows installer.
 :::
 
-The [Conan package manager](https://www.conan.io) helps to install all required libraries in a convenient way on every platform. See [Setup pre-requisites](../../getting-started/prerequisites) for installation instructions. Set the CMake option `OGS_USE_CONAN=ON` to enable Conan.
+The [Conan package manager](https://www.conan.io) helps to install all required libraries in a convenient way on every platform. See [Setup pre-requisites](../../getting-started/prerequisites) for installation instructions. If the Conan executable is found Conan is used for third-party library handling. Set the CMake option `OGS_USE_CONAN=OFF` to disable Conan.
 
 ## Advanced usage
 
-Per default when Conan is enabled (`OGS_USE_CONAN=ON`) it will try to fetch prebuilt binaries from the [OGS Conan repository](https://ogs.jfrog.io/ogs/conan/) at https://ogs.jfrog.io/ogs/api/conan/conan. With the CMake option `OGS_CONAN_BUILD` you define what gets build locally. This option can be set to:
+Per default when Conan is enabled it will try to fetch prebuilt binaries from the [OGS Conan repository](https://ogs.jfrog.io/ogs/conan/) at https://ogs.jfrog.io/ogs/api/conan/conan. With the CMake option `OGS_CONAN_BUILD` you define what gets build locally. This option can be set to:
 
 - `missing` - Default, only builds packages which are not available as a prebuilt binary for the current configuration
 - `all` - Builds all packages locally

web/content/docs/devguide/getting-started/build-configuration.pandoc

@@ -23,13 +23,11 @@ So just go ahead and create a build-directory along your source code directory.
 
 ## Install required libraries with Conan
 
-It is preferred to use Conan package manager to install required third-party libraries. To use Conan add the CMake option `OGS_USE_CONAN=ON` to the CMake run (see below). This will run Conan automatically downloading either prebuilt binaries of required libraries or building them locally if a binary for your setup (operating system, compiler, ..) is not available. [Check this]({{< ref "conan-package-manager.pandoc" >}}) for advanced Conan usage.
+It is preferred to use Conan package manager to install required third-party libraries. If [Conan is installed]({{< ref "prerequisites" >}}#step-install-conan-package-manager) it will automatically download either prebuilt binaries of required libraries or build them locally if a binary for your setup (operating system, compiler, ..) is not available. [Check this]({{< ref "conan-package-manager.pandoc" >}}) for advanced Conan usage.
 
 *Note:* Instead of using Conan you can optionally [install the required libraries manually]({{< ref "third-party-libraries.pandoc" >}}).
 
 ::: {.win}
-Add `-DOGS_USE_CONAN=ON` to the CMake-run (see below).
-
 ::: {.note}
 ### <i class="fas fa-exclamation-triangle"></i> Multi-configuration with Conan and Visual Studio
 
@@ -50,14 +48,6 @@ Please also note that in Visual Studio you have to choose the correct configurat
 :::
 :::
 
-::: {.linux}
-Add `-DOGS_USE_CONAN=ON` to the CMake-run (see below).
-:::
-
-::: {.mac}
-Add `-DOGS_USE_CONAN=ON` to the CMake-run (see below).
-:::
-
 
 ## Configure with CMake
 

web/content/docs/devguide/troubleshooting/conan.pandoc

@@ -14,7 +14,7 @@ weight = 1042
 When CMake is run Conan will download library packages. You can see under `Requirements` in the CMake output from where the packages will be downloaded. Most packages will come `from ogs`:
 
 ```bash
-$ cmake ../ogs -DOGS_USE_CONAN=ON
+$ cmake ../ogs
 ...
 -- Conan executing: conan install . -g cmake -s build_type=Release -s os=Macos -s compiler=apple-clang -s compiler.version=9.0 -s compiler.libcxx=libc++ --build=missing --update
 PROJECT: Installing /Users/bilke/code/ogs6/build-n/conanfile.txt