Updates to the world page

<p><strong>tl;dr</strong> — you can now find remote categories and see your tracked/watched categories in <code>/world</code>.</p> <p>A new alpha version of NodeBB was tagged today: v4.3.0-alpha.3. The biggest change is to the <code>/world</code> route, which up until now showed a list of topics from outside of the local NodeBB instance.</p> <p>New to this alpha release:</p> <ol> <li>A quick search widget was added, allowing you to directly search for remote categories. There is no need to navigate to to the search page to discover new categories.</li> <li>Your list of <em>tracked</em> and <em>watched</em> categories will show at the top of the page. <ul> <li>"Tracking" and "Watching" categories—both local and remote—is how content discovery happens in NodeBB. <em>Tracked</em> categories will have new content show up in the "unread" page, while <em>watched</em> categories take that a step further and <em>notify</em> you when new content is posted.</li> <li>Tracking and watching a category will tell NodeBB to subscribe to that remote community for updates</li> </ul> </li> </ol> <p>At this time we're continuing to look for stability issues with the remote category integration. We'll be working on QoL fixes as we move into the beta phase this/next week.</p> <p><img src="https://community.nodebb.org/assets/uploads/files/1744055639036-60bd030a-7626-4629-9ac4-8ddd2bd34f3f-image.png" alt="60bd030a-7626-4629-9ac4-8ddd2bd34f3f-image.png" /></p> <p><img src="https://community.nodebb.org/assets/uploads/files/1744055651224-0a11627f-65cc-477b-8c33-49f1ea6de53f-image.png" alt="0a11627f-65cc-477b-8c33-49f1ea6de53f-image.png" /></p>