feat: custom branding (#112)

* add first concept

* remove setup status

* split config page in multiple components

* add custom branding docs

* add test email button

* fix invalid email from header

* add migration

* mount images to host

* update docs

* remove unused endpoint

* run formatter

frontend/src/types/config.type.ts

@@ -10,11 +10,11 @@ export type UpdateConfig = {
 };
 
 export type AdminConfig = Config & {
+  name: string;
   updatedAt: Date;
   secret: boolean;
   description: string;
   obscured: boolean;
-  category: string;
 };
 
 export type AdminConfigGroupedByCategory = {
@@ -29,6 +29,11 @@ export type AdminConfigGroupedByCategory = {
   ];
 };
 
+export type ConfigVariablesCategory = {
+  category: string;
+  count: number;
+};
+
 export type ConfigHook = {
   configVariables: Config[];
   refresh: () => void;