Improve password handling

- Error out if auth is enabled but no password is passed in
- Indicate password location on login page

.eslintrc.yaml

@@ -22,6 +22,7 @@ rules:
   # For overloads.
   no-dupe-class-members: off
   "@typescript-eslint/no-use-before-define": off
+  "@typescript-eslint/no-non-null-assertion": off
 
 settings:
   # Does not work with CommonJS unfortunately.