Add og meta tags and icon

[prajwalkulkarni]

💫 Changelog

⭐ Add og meta tags to increase visibility and information when the URL is shared.
⭐ Added missing icon to the website.
⭐ Updated to use const instead of var in index.html's inline script.
⭐ Use shorthand notation to hide menu items' description text.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aff556b) 82.61% compared to head (062f053) 82.55%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #769      +/-   ##
==========================================
- Coverage   82.61%   82.55%   -0.07%     
==========================================
  Files         141      141              
  Lines       11511    11513       +2     
  Branches     2130     2127       -3     
==========================================
- Hits         9510     9504       -6     
- Misses       1670     1677       +7     
- Partials      331      332       +1     

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