Add formbricks feedback

[mattinannt]

Changes proposed ✍️

Add Formbricks Feedback Widget to crowd.dev to improve feedback submissions.

• Adds a new menu entry "Feedback" to side menu (if environment variables set && language set (TODO: good way to disable for non-english)
• Adds Feedback Widget with customized colors and customer information
• Sends Feedback to Formbricks Cloud or a self-hosted instance of Formbricks to manage Feedback and receive notifications on new submissions

These new environment variables got introduced:

VUE_APP_FORMBRICKS_URL=https://xm.formbricks.com
VUE_APP_FORMBRICKS_FORM_ID=clcq5n4h80000l808jyrdx82i

To test, go to (Formbricks XM)[https://xm.formbricks.com], create a new account, create a new form and copy the form ID from "Setup Instructions" to your env variables. Start the crowd.dev server, send a feedback and view feedback in Formbricks. If you like to receive email notifications on new submissions you can also setup a "Data Pipeline" for E-Mail in Formbricks.

• Screenshots (front-end changes only)