Initial setup (first pass) (#1)

* Updated Elixir version; made phx interactive

* Added JS formatting rules

* Added yt-dlp to dockerfile

* Added a basic PR template

* Added default responses for the PR template

.github/pull_request_template.md

@@ -0,0 +1,15 @@
+## What's new?
+
+N/A
+
+## What's changed?
+
+N/A
+
+## What's fixed?
+
+N/A
+
+## Any other comments?
+
+N/A