Remove unfinished timeline feature

Would be nice to have, but realistically, I don't have time to finish
it, won't any time soon, no one else has worked on it, and no one else
has asked for it. And now it's hosing up the Jekyll site generator
output with deprecation warnings about SCSS division, so... goodbye!

Author: ctrueden

_bin/check-class-usage.sh

@@ -15,7 +15,6 @@ cssfiles="
 assets/css/main.css
 assets/css/layout.css
 assets/css/includes.css
-assets/css/timeline.css
 assets/css/dock.css
 assets/css/noscript.css
 assets/css/home.css

_includes/layout/head

@@ -9,7 +9,6 @@
     <link rel="stylesheet" href="/assets/css/main.css" />
     <link rel="stylesheet" href="/assets/css/layout.css"/>
     <link rel="stylesheet" href="/assets/css/includes.css" />
-    <link rel="stylesheet" href="/assets/css/timeline.css"/>
     <link rel="stylesheet" href="/assets/css/dock.css"/>
     <noscript><link rel="stylesheet" href="/assets/css/noscript.css" /></noscript>
 

_includes/layout/menu

@@ -200,7 +200,6 @@
               <li><a href="/editing/statbox">Statbox</a></li>
               <li><a href="/editing/symbols">Symbols</a></li>
               <li><a href="/editing/tables">Tables</a></li>
-              <li><a href="/editing/timelines">Timelines</a></li>
               <li><a href="/editing/tooltips">Tooltips</a></li>
               <li><a href="/editing/videos">Videos</a></li>
               <li><a href="/editing/whitespace">Whitespace</a></li>

_includes/timeline

@@ -204,8 +204,6 @@ The first imaging program that {% include person id='rasband' %} developed, star
 
 Here is a timeline of software development related to ImageJ:
 
-{% comment %}{% include timeline title="Flavors of ImageJ" timeline=page.timeline-imagej initial='1987' %}{% endcomment %}
-
 ![](/media/software/timeline-history-of-imagej.png)
 
 ## Publications