about: update homepage and sidebar

Update the copy on the homepage to reflect the new content of the About
page, and remove the now-deleted about pages from the sidebar.

Signed-off-by: Julia Evans <[email protected]>

Author: jvns

layouts/partials/masthead.html

@@ -2,17 +2,15 @@
   <div class="inner">
     <div>
       <p>
-        Git is a <a href="{{ relURL "about/free-and-open-source" }}">free and open source</a>
+        Git is a <a href="{{ relURL "about/#free-and-open-source" }}">free and open source</a>
         distributed version control system designed to handle everything from small to
         very large projects with speed and efficiency.
       </p>
       <p>
-        Git is <a href="{{ relURL "doc" }}">easy to learn</a> and has a
-        <a href="{{ relURL "about/small-and-fast" }}">tiny footprint with lightning fast performance</a>.
-        It outclasses SCM tools like Subversion, CVS, Perforce, and ClearCase
-        with features like <a href="{{ relURL "about/branching-and-merging" }}">cheap local branching</a>,
-        convenient <a href="{{ relURL "about/staging-area" }}">staging areas</a>, and
-        <a href="{{ relURL "about/distributed" }}">multiple workflows</a>.
+        Git is <a href="{{ relURL "about" }}">lightning fast</a> and has a huge ecosystem of
+        <a href="{{ relURL "tools/guis" }}">GUIs</a>,
+        <a href="{{ relURL "tools/hosting" }}">hosting services</a>, and
+        <a href="{{ relURL "tools/command-line" }}">command-line tools</a>.
       </p>
     </div>
     <div class="illustration-wrapper">

layouts/partials/sidebar.html

@@ -5,16 +5,10 @@
     <ul>
       <li>
         <a href="{{ relURL "about" }}"{{ if (eq $section "about") }} class="active"{{ end }}>About</a>
-        <ul{{ if (eq $section "about") }} class="expanded"{{ end }}>
-          {{ if (eq $section "about") }}
-          {{ $subsection := .Params.subsection }}
-          {{ $abouts := sort (where .Site.RegularPages "Params.section" "about") "Params.order"  }}
-          {{ range $i, $about := $abouts }}
-            <li>
-              <a href="{{ relURL (strings.TrimSuffix ".html" $about.RelPermalink) }}"{{ if (eq $.Params.subsection $about.Params.subsection) }} class="active"{{ end }}>{{ $about.Params.subtitle }}</a>
-            </li>
-          {{ end }}
-          {{ end }}
+        <ul {{ if (eq $section "about") }} class="expanded"{{ end }}>
+          <li>
+            <a href="{{ relURL "about/trademark" }}"{{ if (eq .Params.Subsection "trademark") }} class="active"{{ end }}>Trademark</a>
+          </li>
         </ul>
       </li>
 

layouts/partials/site-root.html

@@ -6,7 +6,7 @@
           <a href="{{ relURL "about" }}">
             <img src="{{ relURL "images/icons/fa-gears.svg" }}" width="74" height="74" />
             <h3>About</h3>
-            <p>The advantages of Git compared to other source control systems.</p>
+            <p>Git's performance and ecosystem</p>
           </a>
         </li>
         <li>