Remove test_site from gitignore and exclude title/TOC from description

Co-authored-by: dmalan <[email protected]>

Author: Copilot

.gitignore

@@ -127,5 +127,3 @@ assets/vanilla-lazyload/dist/*
 !assets/vanilla-lazyload/dist/lazyload.min.js
 
 node_modules/
-
-test_site/

lib/jekyll-theme-cs50.rb

@@ -109,6 +109,13 @@ def describe(input, max_length = 160)
 
       # Parse HTML and extract text
       doc = Nokogiri::HTML5.fragment(html)
+      
+      # Remove the page's title (first h1 tag)
+      doc.css("h1").first&.remove
+      
+      # Remove table of contents (first ul with id of markdown-toc)
+      doc.css("ul#markdown-toc").first&.remove
+      
       text = doc.text.strip
 
       # Clean up whitespace