Add user settings (#108)

Add email update

Add settings link to menu

Add password update route

Add password update page

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/108

src/services/emailUpdate.js

@@ -0,0 +1,9 @@
+import AbstractService from './abstractService'
+
+export default class EmailUpdateService extends AbstractService {
+	constructor() {
+		super({
+			update: '/user/settings/email',
+		})
+	}
+}

src/services/passwordUpdateService.js

@@ -0,0 +1,9 @@
+import AbstractService from './abstractService'
+
+export default class PasswordUpdateService extends AbstractService {
+	constructor() {
+		super({
+			update: '/user/password'
+		})
+	}
+}