Expanded tag database.

src/tags.js

@@ -9,7 +9,7 @@ async function matchTags(rawTags) {
         .orWhereIn('tags.tag', rawTags.map(tag => tag.toLowerCase()))
         .leftJoin('tags as original', 'tags.alias_for', 'original.tag');
 
-    return tagEntries.map(({ tag }) => tag);
+    return Array.from(new Set(tagEntries.map(({ tag }) => tag))).sort(); // reduce to tag name and filter duplicates
 }
 
 module.exports = { matchTags };