370 implement session persistance for login ui

Closes #370 (closed)

What does this MR do?

This MR added the possibility to save the login datas in the cookies, for a steady login. Also a link to reset the password is added in the popover.

How confident are you it won't break things if deployed?

I dont know :)

Links to related issues

#370 (closed) https://yunity.slack.com/archives/C74JC2V26/p1593755874028600

How to test

1. Checkout branch locally
2. Login as foodsaver
3. Close the whole browser
4. Open the browser an go to dashboard
5. You are logged out
6. Write the email address
7. Click in the password box
8. check the chekcbox in the popover
9. Write the password
10. Login
11. Close the whole browser again
12. Open the browser again
13. You should stay logged in

Screenshots (if applicable)

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))
• Once your MR has been merged, you are responsible to update the #foodsharing-beta Slack channel about what has been changed here. They will test your work in different browsers, roles or other settings