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

backend/lib/utils.js

@@ -0,0 +1,20 @@
+const exec = require('child_process').exec;
+
+module.exports = {
+
+    /**
+     * @param   {String} cmd
+     * @returns {Promise}
+     */
+    exec: function (cmd) {
+        return new Promise((resolve, reject) => {
+            exec(cmd, function (err, stdout, stderr) {
+                if (err && typeof err === 'object') {
+                    reject(err);
+                } else {
+                    resolve(stdout.trim());
+                }
+            });
+        });
+    }
+};