Add Next.js browser shim and update headers/format

[desmap]

[Updated layout since the PR before was not consistent] Since Next.js is quite popular and it took me some time to figure this out, this might be helpful for others

[codecov[bot]]

Codecov Report

Merging #669 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #669   +/-   ##
=======================================
  Coverage   95.08%   95.08%           
=======================================
  Files          80       80           
  Lines        1465     1465           
  Branches      286      286           
=======================================
  Hits         1393     1393           
  Misses         69       69           
  Partials        3        3           

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