Drop the links to Scala 2 and Scala 3 pages and integrate on landing page

The links were not visible enough and made it difficult to discover the additional
content. Instead all content is now presented on the landing page and can simply
be discovered by scrolling. This made the Scala 2 page obsolete (at least for now).

I keep the Scala 3 page since we want to be able to link to the "Scala 3" documentation.

Author: b-studios

_layouts/documentation.html

@@ -33,14 +33,11 @@ <h1>Scala 2</h1>
        <div class="inner-box">
         {% include documentation-sections.html sections=page.scala2-sections %}
       </div>
-      <div class="language-footer">
-        <a class="go-btn" href="/scala2"><i class="fa fa-arrow-right" aria-hidden="true"></i> Continue to the <strong>Scala 2</strong> Documentation</a>
-      </div>
     </div>
 
     <div class="wrap scala3">
       <div class="language-header">
-        <h1>Scala 3 (Pre-Release Preview)</h1>
+        <h1>Scala 3 (Preview)</h1>
       </div>
  		  <div class="inner-box">
         <blockquote>
@@ -49,9 +46,6 @@ <h1>Scala 3 (Pre-Release Preview)</h1>
         </blockquote>
         {% include documentation-sections.html sections=page.scala3-sections %}
       </div>
-      <div class="language-footer">
-        <a class="go-btn" href="/scala3"><i class="fa fa-arrow-right" aria-hidden="true"></i> Continue to the <strong>Scala 3</strong> Documentation</a>
-      </div>
     </div>
   </section>
 

index.md

@@ -3,9 +3,11 @@ layout: documentation
 title: Documentation
 namespace: root
 partof: documentation
+more-resources-label: More Resources
 
 scala3-sections:
-  - links:
+  - title: "First steps"
+    links:
       - title: "New in Scala 3"
         description: "An overview of the exciting new features in Scala 3."
         icon: "fa fa-star"
@@ -18,9 +20,28 @@ scala3-sections:
         description: "An online book introducing the main language features."
         icon: "fa fa-book"
         link: /scala3/book/introduction.html
+  - title: "More detailed information"
+    links:
+      - title: "Migration Guide"
+        description: "A guide to help you migrate from Scala 2 to Scala 3."
+        icon: "fa fa-suitcase"
+        link: https://scalacenter.github.io/scala-3-migration-guide/
+      - title: "Guides"
+        description: "Detailed guides about particular aspects of the language."
+        icon: "fa fa-map"
+        link: /scala3/guides
+      - title: "API"
+        description: "API documentation for every version of Scala 3."
+        icon: "fa fa-file-text"
+        link: https://dotty.epfl.ch/api/index.html
+      - title: "Language Reference"
+        description: "The Scala 3 language reference."
+        icon: "fa fa-book"
+        link: https://dotty.epfl.ch/docs/reference/overview.html
 
 scala2-sections:
-  - links:
+  - title: "First Steps..."
+    links:
       - title: "Getting Started"
         description: "Install Scala on your computer and start writing some Scala code!"
         icon: "fa fa-rocket"
@@ -33,7 +54,14 @@ scala2-sections:
         description: "An online book introducing the main language features."
         icon: "fa fa-book"
         link: /overviews/scala-book/introduction.html
+    more-resources:
+      - title: Online Courses, Exercises, & Blogs
+        url: /learn.html
+      - title: Books
+        url: /books.html
 
+  - title: "Returning Users"
+    links:
       - title: "API"
         description: "API documentation for every version of Scala."
         icon: "fa fa-file-text"
@@ -42,8 +70,31 @@ scala2-sections:
         description: "In-depth documentation covering many of Scala's features."
         icon: "fa fa-database"
         link: /overviews/index.html
+      - title: "Style Guide"
+        description: "An in-depth guide on how to write idiomatic Scala code."
+        icon: "fa fa-bookmark"
+        link: /style/index.html
+      - title: "Cheatsheet"
+        description: "A handy cheatsheet covering the basics of Scala's syntax."
+        icon: "fa fa-list"
+        link: /cheatsheets/index.html
+      - title: "Scala FAQs"
+        description: "A list of frequently-asked questions about Scala language features and their answers."
+        icon: "fa fa-question-circle"
+        link: /tutorials/FAQ/index.html
       - title: "Language Spec"
         description: "Scala's formal language specification."
         icon: "fa fa-book"
         link: https://scala-lang.org/files/archive/spec/2.13/
+
+  - title: "Scala Evolution"
+    links:
+      - title: "SIPs"
+        description: "The Scala Improvement Process. Language & compiler evolution."
+        icon: "fa fa-cogs"
+        link: /sips/index.html
+      - title: "SPP"
+        description: "The Scala Platform Process. Community-driven library evolution."
+        icon: "fa fa-users"
+        link: https://platform.scala-lang.org
 ---

scala2.md

@@ -8,8 +8,12 @@ discourse: true
 more-resources-label: More Resources
 sections:
 
-  - title: "Scala 3 (Preview)"
+  - title: "First Steps"
     links:
+      - title: "New in Scala 3"
+        description: "An overview of the exciting new features in Scala 3."
+        icon: "fa fa-star"
+        link: /scala3/new-in-scala3.html
       - title: "Getting Started"
         description: "Install Scala 3 on your computer and start writing some Scala code!"
         icon: "fa fa-rocket"
@@ -18,14 +22,12 @@ sections:
         description: "An online book introducing the main language features."
         icon: "fa fa-book"
         link: /scala3/book/introduction.html
+  - title: "More Detailed Information"
+    links:
       - title: "Migration Guide"
         description: "A guide to help you migrate from Scala 2 to Scala 3."
         icon: "fa fa-suitcase"
         link: https://scalacenter.github.io/scala-3-migration-guide/
-      - title: "New in Scala 3"
-        description: "An overview of the exciting new features in Scala 3."
-        icon: "fa fa-star"
-        link: /scala3/new-in-scala3.html
       - title: "Guides"
         description: "Detailed guides about particular aspects of the language."
         icon: "fa fa-map"