[web] Changes due to tailwind update.

See https://tailwindcss.com/docs/upgrade-guide.

web/layouts/_default/baseof.html

@@ -22,7 +22,7 @@
     <div class="{{ if $subsection }}flex overflow-hidden{{ end }}">
 
       {{ if $subsection }}
-      <div class="hidden md:flex md:flex-shrink-0">
+      <div class="hidden md:flex md:shrink-0">
         <nav class="flex flex-col w-64 lg:w-72 pl-2 pr-4 mt-1 text-sm lg:text-base">
           {{ $currentMenu := index .Site.Menus $section }}
           {{ range $currentMenu }}

web/layouts/partials/components/news.html

@@ -34,7 +34,7 @@
           class="text-l lg:text-xl font-bold leading-7 text-blue-800 underline mt-3 line-clamp-1 lg:line-clamp-2">
         </h3>
         <div class="mt-2 flex items-center">
-          <div class="flex-shrink-0">
+          <div class="shrink-0">
             <img class="h-10 w-10 rounded-full" x-bind:src="getUserAvatar(topic)" alt="author avatar">
           </div>
           <div class="ml-3">
@@ -68,7 +68,7 @@
         </div>
       </a>
   </template>
-  <button class="hidden py-2 px-4 rounded bg-blue-500 text-white flex-grow-0" type="button" x-on:click="reload()">
+  <button class="hidden py-2 px-4 rounded bg-blue-500 text-white grow-0" type="button" x-on:click="reload()">
     Reload
   </button>
 </div>

web/layouts/section/releases.html

 {{ define "main" }}
 <div class="flex overflow-hidden">
 
-  <div class="hidden md:flex md:flex-shrink-0">
+  <div class="hidden md:flex md:shrink-0">
     <nav class="flex flex-col w-56 lg:w-64 pl-2 pr-4 mt-1 text-sm lg:text-base text-gray-700">
       <div class="mb-2 border-b-2 mr-2 text-gray-500">Table of contents</div>
       <div class="mb-2 hover:text-gray-900">

web/tailwind.config.js

 const defaultTheme = require('tailwindcss/defaultTheme')
+const colors = require('tailwindcss/colors')
 
 module.exports = {
-  purge: [
+  content: [
     './layouts/**/*.html',
   ],
   theme: {
@@ -31,6 +32,9 @@ module.exports = {
           800: '#072350',
           900: '#051735',
         },
+        green: colors.emerald,
+        yellow: colors.amber,
+        purple: colors.violet
       }
     },
   },