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/js/app/empty/main.ejs

@@ -0,0 +1,11 @@
+<% if (title) { %>
+    <h1 class="h2 mb-3"><%- title %></h1>
+<% }
+
+if (subtitle) { %>
+    <p class="h4 text-muted font-weight-normal mb-7"><%- subtitle %></p>
+<% }
+
+if (link) { %>
+    <a class="btn btn-<%- btn_color %>" href="#"><%- link %></a>
+<% } %>