Fix: Sidebar Icons update on changing theme

[ManishMadan2882]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• Fixes bug in the nav bar icons
• Adding Custom Hook useDarkTheme() which returns as [isDarkTheme, toggleTheme]
  

• Why was this change needed? (You can also link to an open issue here)

• Appropriate icons didn't display as per the selected theme.

• Demo:
  

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[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (6058939) 19.11% compared to head (dea3853) 19.13%.
Report is 8 commits behind head on main.

Files	Patch %	Lines
application/api/answer/routes.py	0.00%	3 Missing ⚠️
scripts/parser/open_ai_func.py	0.00%	2 Missing ⚠️
scripts/code_docs_gen.py	0.00%	1 Missing ⚠️
scripts/old/ingest_rst.py	0.00%	1 Missing ⚠️
scripts/old/ingest_rst_sphinx.py	0.00%	1 Missing ⚠️
scripts/parser/py2doc.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #844      +/-   ##
==========================================
+ Coverage   19.11%   19.13%   +0.01%     
==========================================
  Files          65       65              
  Lines        3013     3016       +3     
==========================================
+ Hits          576      577       +1     
- Misses       2437     2439       +2     

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Name	Status	Preview	Comments	Updated (UTC)
docs-gpt	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 1, 2024 9:51am

[dartpain]

Works great, Thank you!