Source title regex filtering (#98)

* Added a basic/advanced mode to source form

* Added regex field and UI to source form

* Implemented title regex filtering

lib/pinchflat_web/controllers/media_profiles/media_profile_html/media_profile_form.html.heex

@@ -238,7 +238,7 @@
       />
     </section>
 
-    <.button class="my-10 sm:mb-7.5 w-full sm:w-auto">Save Media profile</.button>
+    <.button class="my-10 sm:mb-7.5 w-full sm:w-auto" rounding="rounded-lg">Save Media profile</.button>
   </section>
 
   <div class="rounded-sm dark:bg-meta-4 p-4 md:p-6 mb-5">