Feat/new UI (#153)

* wip

* feat: make forms functional

* feat: finalize pages

* chore: remove unused translations

* feat: app context

* feat: user context

* feat: finalize username login

* fix: use correct tab order in login form

* feat: add oauth logic

* chore: update readme and assets

* chore: rename docs back to assets

* feat: favicons

* feat: custom background image config option

* chore: add acknowledgements for background image

* feat: sanitize redirect URL

* feat: sanitize redirect URL on check

* chore: fix dependabot config

* refactor: bot suggestions

* fix: correctly redirect to app and check for untrusted redirects

* fix: run oauth auto redirect only when there is a redirect URI

* refactor: change select color

* fix: fix dockerfiles

* fix: fix hook rendering

* chore: remove translations cdn

* chore: formatting

* feat: validate api response against zod schema

* fix: use axios error instead of generic error in login page

frontend/src/lib/utils.ts

@@ -0,0 +1,19 @@
+import { clsx, type ClassValue } from "clsx";
+import { twMerge } from "tailwind-merge";
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs));
+}
+
+export const isValidUrl = (url: string) => {
+  try {
+    new URL(url);
+    return true;
+  } catch (e) {
+    return false;
+  }
+};
+
+export const capitalize = (str: string) => {
+  return str.charAt(0).toUpperCase() + str.slice(1);
+};