removed all target=blank from base.html

[catherinefromont]

Fixes: #210

TODOs (if any): A picture of a cute animal (not mandatory but encouraged):

[coveralls]

Coverage remained the same at 72.269% when pulling 3680dcb5efd5a2f3d3c8588c24f190ac5a33d411 on catherinefromont:bug-fix into 50e3f02064ebe5b86d394005fd91b2d03c0fdc53 on OpenSourceHelpCommunity:predev.

[anubhakushwaha]

@catherinefromont Please add the issue number it fixes.

[amarlearning]

Thanks, @catherinefromont :100: But it looks like this issue has been resolved only the changes are pending and needed to be migrated to the master branch.

@tapasweni-pathak reminder.