Remove /panel/file_links.html

Modern search engines evaluate JavaScript, so it is unclear whether they
will crawl a link that is hidden via JavaScript.  Also, if they do see
the link, there could be an SEO penalty.  There are reports that Google
penalizes hidden backlinks (in other words, hidden links that exist
solely to game the page rank algorithm), but it's unclear whether that
applies to intra-site hidden links.

Regardless, since d0e2ead, all sidebar
links are actual links, so search engines can crawl the entire site
without `/panel/file_links.html`.  Therefore, this commit removes
`/panel/file_links.html`.

lib/rdoc/generator/template/rails/_panel.rhtml

@@ -24,7 +24,5 @@
     <div class="panel__nav content">
       <% yield if block_given? %>
     </div>
-
-    <a id="links" href="/panel/file_links.html">index</a>
   </div>
 </nav>

lib/rdoc/generator/template/rails/resources/js/main.js

@@ -48,10 +48,6 @@ document.addEventListener("turbo:load", () => {
   }
 }, { once: true });
 
-document.addEventListener("turbo:load", function() {
-  $('#links').hide();
-});
-
 
 // Hide menu on mobile when navigating to a named anchor on the current page.
 // For example, when clicking on a method in the method list.

lib/sdoc/generator.rb

@@ -88,8 +88,6 @@ def generate
     FileUtils.mkdir_p(@output_dir)
     copy_resources
     generate_search_index
-    generate_file_links
-
     generate_index_file
     generate_file_files
     generate_class_files
@@ -135,26 +133,18 @@ def render_file(template_path, output_path, context = nil)
     output_path.write(result)
   end
 
-  ### Generate index.html
   def generate_index_file
     render_file("index.rhtml", "index.html", index)
   end
 
-  ### Generate a documentation file for each class
   def generate_class_files
     @classes.each { |klass| render_file("class.rhtml", klass.path, klass) }
   end
 
-  ### Generate a documentation file for each file
   def generate_file_files
     @files.each { |file| render_file("file.rhtml", file.path, file) }
   end
 
-  ### Generate file with links for the search engine
-  def generate_file_links
-    render_file("file_links.rhtml", "panel/file_links.html", @files)
-  end
-
   def generate_search_index
     debug_msg "Generating search index"
     unless @options.dry_run