[Enhancement] Added search to source forms (#259)

* Changed sqlite FTS to use a trigram tokenizer

* Added search UI to source tables

* Fix bug with special chars in search form

* improved main search results form

* Improved centering for media table header elements

lib/pinchflat_web/components/layouts/partials/header.html.heex

@@ -22,7 +22,7 @@
             type="text"
             name="q"
             value={@params["q"]}
-            placeholder="Type to search..."
+            placeholder="Search all media..."
             class="w-full bg-transparent pl-9 pr-4 border-0 focus:ring-0 focus:outline-none"
           />
         </form>