fix: make tags link to category pages instead of filtering in place

Clicking a category or group tag filtered the homepage table in place while rewriting the address bar to the category URL, so one URL rendered two different pages and readers never reached category pages with their intros and guides; category pages also showed a redundant self-referential filter bar.

Co-Authored-By: Claude <noreply@anthropic.com>

website/templates/index.html

@@ -96,7 +96,6 @@
 </section>
 {% endif %}
 
-<script type="application/json" id="filter-urls">{{ filter_urls_json | safe }}</script>
 <section class="results-section" id="library-index">
   <div class="results-intro section-shell" data-reveal>
     <div>
@@ -132,12 +131,6 @@
         aria-label="Search projects"
       />
     </div>
-    <div class="filter-bar" aria-live="polite">
-      <span>Filtering for <strong class="filter-value"></strong></span>
-      <button class="filter-clear" aria-label="Clear filter">
-        Clear filter
-      </button>
-    </div>
   </div>
 
   <h2 class="sr-only">Results</h2>
@@ -175,7 +168,6 @@
         {% for entry in entries %}
         <tr
           class="row"
-          data-tags="{{ entry.categories | join('||') }}{% if entry.subcategories %}||{{ entry.subcategories | map(attribute='value') | join('||') }}{% endif %}||{{ entry.groups | join('||') }}{% if entry.source_type == 'Stdlib' %}||Stdlib{% endif %}"
           tabindex="0"
           aria-expanded="false"
           aria-controls="expand-{{ loop.index }}"
@@ -221,23 +213,19 @@
           </td>
           <td class="col-cat">
             {% for subcat in entry.subcategories %}
-            <a class="tag" href="{{ subcat.url }}" data-value="{{ subcat.value }}" data-url="{{ subcat.url }}">
+            <a class="tag" href="{{ category_urls[subcat.value.split(' > ')[0]] }}#{{ subcat.slug }}">
               {{ subcat.name }}
             </a>
             {% endfor %} {% for cat in entry.categories %}
             <a
               class="tag"
               href="{{ category_urls[cat] }}"
-              data-value="{{ cat }}"
-              data-url="{{ category_urls[cat] }}"
               >{{ cat }}</a
             >
             {% endfor %}
             <a
               class="tag tag-group"
               href="{{ filter_urls[entry.groups[0]] }}"
-              data-value="{{ entry.groups[0] }}"
-              data-url="{{ filter_urls[entry.groups[0]] }}"
             >
               {{ entry.groups[0] }}
             </a>
@@ -245,8 +233,6 @@
             <a
               class="tag tag-source"
               href="/categories/built-in/"
-              data-value="Stdlib"
-              data-url="/categories/built-in/"
             >
               Stdlib
             </a>