feat(changelog): add performance, accessibility, docs category tabs

Aligns the changelog page with the updated indiekit endpoint-github
patch (patch-endpoint-github-changelog-categories.mjs) which now
categorizes perf:/a11y:/docs: commit prefixes in addition to
feat:/fix:.

changelog.njk

@@ -120,18 +120,27 @@ function changelogApp() {
       { key: 'all', label: 'All' },
       { key: 'features', label: 'Features' },
       { key: 'fixes', label: 'Fixes' },
+      { key: 'performance', label: 'Performance' },
+      { key: 'accessibility', label: 'Accessibility' },
+      { key: 'documentation', label: 'Docs' },
       { key: 'other', label: 'Other' },
     ],
 
     categoryLabels: {
       features: 'Features',
       fixes: 'Fixes',
+      performance: 'Performance',
+      accessibility: 'Accessibility',
+      documentation: 'Docs',
       other: 'Other',
     },
 
     categoryColors: {
       features: 'bg-green-100 dark:bg-green-900 text-green-700 dark:text-green-300',
       fixes: 'bg-orange-100 dark:bg-orange-900 text-orange-700 dark:text-orange-300',
+      performance: 'bg-blue-100 dark:bg-blue-900 text-blue-700 dark:text-blue-300',
+      accessibility: 'bg-purple-100 dark:bg-purple-900 text-purple-700 dark:text-purple-300',
+      documentation: 'bg-yellow-100 dark:bg-yellow-900 text-yellow-700 dark:text-yellow-300',
       other: 'bg-surface-100 dark:bg-surface-800 text-surface-700 dark:text-surface-300',
     },