docs: add Vercel guide

[Youhan]

I was looking into a solution for the error on Vercel and found the solution in the closed issues back in 2020.
#106

I thought might be a good idea to add it to docs. I thought maybe to add a Deploy page to the guides section.

[codecov]

Codecov Report

Merging #191 (e8f95cd) into dev (c3acdbd) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               dev      #191   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          261       261           
  Branches        57        57           
=========================================
  Hits           261       261           

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