Resend activation email functionality added

[ihsaan-ullah]

@ mention of reviewers

@Didayolo @ObadaS

A brief description of the purpose of the changes contained in this PR.

Now users can resend account activation emails if they haven't received the link or the link is expired.

Screenshots

Resend activation link screen (http://localhost/accounts/resend_activation/)

When user clicks the activation link and it is expired, they are taken to this screen automatically

user enters wrong email in the activation sceen

user enters email that is already activated

user enters correct email (not activated). user is taken to home page with this message

Issues this PR resolves

• No "Resend confirmation email" function #1018

Todo

• update wiki to mention this feature for users who have lost the link and can use this to resend the link

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge

[Didayolo]

@ihsaan-ullah How can users access this screen? Except from an expired link.

Maybe when trying to log into an unactived account should redirect there?

We just have a message right now in that case:

[ihsaan-ullah]

Now you can click the link in the error when account is not activated