Major overhaul

- Docker buildx support in CI
- Cypress API Testing in CI
- Restructured folder layout (insert clean face meme)
- Added Swagger documentation and validate API against that (to be completed)
- Use common base image for all supported archs, which includes updated nginx with ipv6 support
- Updated certbot and changes required for it
- Large amount of Hosts names will wrap in UI
- Updated packages for frontend
- Version bump 2.1.0

frontend/html/index.ejs

@@ -0,0 +1,9 @@
+<% var title = 'Nginx Proxy Manager' %>
+<%- include partials/header.ejs %>
+
+<div id="app" class="page">
+	<span class="loader"></span>
+</div>
+
+<script type="text/javascript" src="/js/main.bundle.js?v=<%= version %>"></script>
+<%- include partials/footer.ejs %>