Add a "change my password" page

[lkeegan]

Is your feature request related to a problem? Please describe.
Users can request a password reset if they have forgotten their password, but they should also be able to change their password.

Describe the solution you'd like
A page where they can enter a new password, where they should enter:

• their current password
• their new password
• their new password again

Additional context
The backend provides a PATCH /users/me endpoint to modify the current user:

https://mondey.lkeegan.dev/api/docs#/users/users_patch_current_user_users_me_patch

The frontend has auto-generated client code to interact with the backend, here is the corresponding function:

mondey/frontend/src/lib/client/services.gen.ts

Lines 436 to 441 in ffcb6ae

	export const usersPatchCurrentUser = <ThrowOnError extends boolean = false>(options: Options<UsersPatchCurrentUserData, ThrowOnError>) => {
	return (options?.client ?? client).patch<UsersPatchCurrentUserResponse, UsersPatchCurrentUserError, ThrowOnError>({
	...options,
	url: '/users/me'
	});
	};

where UsersPatchCurrentUserData is a type definition generated from the API:

mondey/frontend/src/lib/client/types.gen.ts

Lines 627 to 629 in ffcb6ae

	export type UsersPatchCurrentUserData = {
	body: UserUpdate;
	};

mondey/frontend/src/lib/client/types.gen.ts

Lines 294 to 303 in ffcb6ae

	export type UserUpdate = {
	password?: (string | null);
	email?: (string | null);
	is_active?: (boolean | null);
	is_superuser?: (boolean | null);
	is_verified?: (boolean | null);
	is_researcher?: (boolean | null);
	full_data_access?: (boolean | null);
	research_group_id?: (number | null);
	};