Move RTL styles from style-rtl.css to style.css only

[meel-hd]

Proposed changes

Changes:

• All the RTL styles are moved into one file (style.css).
• style-rtl.css is removed.
• The base.html template is updated.

close: #2415

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.71%. Comparing base (4e6d106) to head (cf35cc9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2424      +/-   ##
==========================================
+ Coverage   79.65%   79.71%   +0.06%     
==========================================
  Files          56       56              
  Lines        4876     4876              
  Branches      478      478              
==========================================
+ Hits         3884     3887       +3     
+ Misses        832      829       -3     
  Partials      160      160