Add ability to change password

[brylie]

Currently, there is no way for users to change their password.

Task

• [x] add a password change page
• [x] add a link in the navigation menu to a "change password" page

[Marsh-sudo]

Hello, Created a branch for this issue. Solved it and it works well. Waiting for you to accept my PR :)

[brylie]

Very cool! I've assigned you to this task and reviewed the pull request with minor change suggestions :-)

[brylie]

Closed by #79

Thanks, @Marsh-sudo! I made sure to credit you in the commit and our project contributors section :-)