Ux login page

[ashokaditya]

What is the purpose of this change? What does it change?

Adds another option to log in with on the Sign in page. Changes handlebar templates to adhere to deic-styleguides. Makes all popups consistent in size and color.

Was the change discussed in an issue or in the forum before?

• Fixes #37
• Fixes #38
• Fixes #43
• Fixes #44
• Fixes #45

Are other people/devs interested in this?

@TanguiC @kaspersort @uninth @loregood

PR Checklist

• [x] I have read the Contribution Guidelines
• [x] I have added tests for all changes in this PR
• [x] I have run npm test on the for all commits
• [x] I have added documentation for the changes.
• [x] All commit messages are formatted in the same style as described in DeiC Styleguides
• [x] I'm done, this Pull Request is ready for review