refactor: rework file structure (#325)

* wip: add middlewares

* refactor: use context fom middleware in handlers

* refactor: use controller approach in handlers

* refactor: move oauth providers into services (non-working)

* feat: create oauth broker service

* refactor: use a boostrap service to bootstrap the app

* refactor: split utils into smaller files

* refactor: use more clear name for frontend assets

* feat: allow customizability of resources dir

* fix: fix typo in ui middleware

* fix: validate resource file paths in ui middleware

* refactor: move resource handling to a controller

* feat: add some logging

* fix: configure middlewares before groups

* fix: use correct api path in login mutation

* fix: coderabbit suggestions

* fix: further coderabbit suggestions

internal/utils/fs_utils.go

@@ -0,0 +1,17 @@
+package utils
+
+import "os"
+
+func ReadFile(file string) (string, error) {
+	_, err := os.Stat(file)
+	if err != nil {
+		return "", err
+	}
+
+	data, err := os.ReadFile(file)
+	if err != nil {
+		return "", err
+	}
+
+	return string(data), nil
+}