docs(guide): update nextjs guide for @types/react

[harshcut]

Description

Currently, the guide for Next.js in Server Render gives a type error after updating @types/react to ^18.0.0. The overwrite of styles seems to be causing trouble. The styles are of type styles?: ReactFragment | ReactElement<any, string | JSXElementConstructor<any>>[] | undefined instead of JSX.Element.

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[codecov]

Codecov Report

Merging #784 (4e00d8d) into master (6e70232) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #784   +/-   ##
=======================================
  Coverage   98.85%   98.85%           
=======================================
  Files         198      198           
  Lines        3046     3046           
  Branches      668      668           
=======================================
  Hits         3011     3011           
  Misses         34       34           
  Partials        1        1           

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