Unclear message on incorrect credentials

[iamkunalb]

Fixed unclear pop up message on incorrect credentials

Test:

• Proceed to sign in with incorrect credentials
• Click sign in
• Text boxes should go red to notify user
  or
• Proceed to sign in with no credentials
• Click sign in
• Text boxes should go red to notify user

[0608jennylee]

• The submodules, Pong-Game, VisualGit_SE701_2019_3, and dummy, should be removed from this pull request.
• The image pexels-photo-414612 does not seem to used, this should be removed.

[0608jennylee]

The submodules, Pong-Game, VisualGit_SE701_2019_3, and dummy, should be removed from this pull request.
The image pexels-photo-414612 does not seem to used, this should be removed.
theres some changes that dont seem to do anything, could you fix this, thanks.

outdated comments - resolved by latest commit

[0608jennylee]

Your code looks good, but it seems that you have merge conflicts with master, I am unable to test your code, due to these conflicts, could you correct this as well, thanks

[0608jennylee]

@iamkunalb is this working on your system, for some reason when I test it I just get a bunch of errors and nothing loads

also the transcript compiler is getting some compiler issues from the file you have made modifications to, I'm not sure if this is causing the page to not load