removed profile pic and added an horizontal line to some pages

[clarapbsousa]

Closes #1268
The rightButton has been removed from home.dart, general.dart, and secondary.dart. Additionally, top_navigation_bar.dart has been updated to include an optional horizontal line below the title for pages titled "Faculty" or "Restaurants".

Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

Project coverage is 11%. Comparing base (00bff18) to head (99c1b4d).
Report is 126 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #1294    +/-   ##
========================================
- Coverage       16%     11%    -4%     
========================================
  Files          233     268    +35     
  Lines         7214    7338   +124     
========================================
- Hits          1139     803   -336     
- Misses        6075    6535   +460     

[DGoiana]

Looks good! To finalize, can we just give a little bit of opacity to the line, I think it is too dark.