Change label "Filter" to "Show" in index page

Co-authored-by: brunoborges <129743+brunoborges@users.noreply.github.com>

Author: Copilot

templates/index.html

@@ -227,7 +227,7 @@ <h2 class="section-title">All comparisons</h2>
       <span class="section-badge">{{snippetCount}} snippets</span>
     </div>
     <div class="filter-pills" id="categoryFilter">
-      <span class="filter-label">Filter:</span>
+      <span class="filter-label">Show:</span>
       <button class="filter-pill" data-filter="all">All</button>
       <button class="filter-pill" data-filter="language">Language</button>
       <button class="filter-pill" data-filter="collections">Collections</button>