docs: add job posting sites feature to README and landing page

Author: danbim

README.md

@@ -40,6 +40,7 @@ A single-user application for ranking and tracking job openings using weighted s
 - Rank and filter jobs by formula score, country, track, and wow status
 - Track application status through 7 stages (not applied, applied, interviewing, offer, rejected, ghosted, dumped)
 - Add notes to any job opening
+- Track job posting sites and saved searches with "last checked" timestamps
 - Paste HTML job descriptions — automatically converted to Markdown
 - Back up and restore the database (`bun run db:backup` / `bun run db:restore`)
 

docs/index.html

@@ -60,6 +60,14 @@ <h2>Job Notes</h2>
       </div>
       <img src="screenshots/notes-panel.png" alt="Notes panel showing notes for a job opening">
     </section>
+
+    <section class="feature reverse">
+      <div class="feature-content">
+        <h2>Job Posting Sites</h2>
+        <p>Keep a list of job posting sites and saved search bookmarks. Track when you last checked each one so you never miss new opportunities. One click to mark a site as checked.</p>
+      </div>
+      <img src="screenshots/sites.png" alt="Job posting sites page with last checked dates">
+    </section>
   </main>
 
   <footer>