Implement password reset flow

Description:

Implement a password reset flow, including the form and the backend handling. The user should receive an E-Mail with a link to reset his password.

Requirements:

• Create password reset request form
• Validate E-Mail
• Rate limit requests
• Time limit reset link
• Change password in DB

Acceptance Criteria:

• User should be able to reset password
• User should receive an E-Mail with reset link when requested
• E-Mail should be validated by user before sending link (if E-Mail exists)