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/nginx/certificates/renew.ejs

@@ -0,0 +1,14 @@
+<div class="modal-content">
+    <div class="modal-header">
+        <h5 class="modal-title"><%- i18n('certificates', 'renew-title') %></h5>
+    </div>
+    <div class="modal-body">
+        <div class="waiting text-center">
+            <%= i18n('str', 'please-wait') %>
+        </div>
+        <div class="alert alert-danger error" role="alert"></div>
+    </div>
+    <div class="modal-footer">
+        <button type="button" class="btn btn-secondary cancel" data-dismiss="modal" disabled><%- i18n('str', 'close') %></button>
+    </div>
+</div>