feat: Restructure scripts

- Combine app.js and functions.js
- Rename functions.js to app.js
- Rename variables.js to globals.js
- Remove global.js and add setup call to screen template
- Use local jquery in old templates

source/templates/hippie/app.liquid

@@ -14,7 +14,7 @@
 {% block script %}
 {{ block.super -}}
 <script src="/vendor/jquery.min.js"></script>
-<script src="{{ pageBase }}js/variables.js"></script>
+<script src="{{ pageBase }}js/globals.js"></script>
 <script src="{{ pageBase }}js/app.js"></script>
 
 <script>