2941 styling improvements fixes and improvements

[nicwells]

Fixes BlueBrain/nexus#2941

Description

Includes:
CopyIcon, InfoIcon white colour

• Drop shadow on list items
• Override antd tag blue colour
• Use component background colour for tabs
• Remove background colour from search header
• Remove surplus Manage Studios button
• Remove gradient from list items
• Search bar styling
• Fix font in dev

How has this been tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added necessary unit and integration tests.
• I have added screenshots (if applicable), in the comment section.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (1.7.0-M3@83f48f2). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 4e10908 differs from pull request most recent head f225173. Consider uploading reports for the commit f225173 to get more accurate results

@@             Coverage Diff             @@
##             1.7.0-M3    #1002   +/-   ##
===========================================
  Coverage            ?   66.00%           
===========================================
  Files               ?       21           
  Lines               ?      609           
  Branches            ?      126           
===========================================
  Hits                ?      402           
  Misses              ?      207           
  Partials            ?        0           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 83f48f2...f225173. Read the comment docs.