docs: recipe for nextjs

[homura]

Description

Fixes #688

This PR added an example for working with Next.js

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• Documentation or Website

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.62%. Comparing base (a1592dd) to head (86cdb17).
Report is 18 commits behind head on develop.

❗ Current head 86cdb17 differs from pull request most recent head b73ff45

Please upload reports for the commit b73ff45 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #690      +/-   ##
===========================================
+ Coverage    84.30%   86.62%   +2.32%     
===========================================
  Files          121      126       +5     
  Lines        24574    25164     +590     
  Branches      2364     2698     +334     
===========================================
+ Hits         20717    21799    +1082     
+ Misses        3816     3328     -488     
+ Partials        41       37       -4     

Files	Coverage Δ
packages/hd/src/xpub_store.ts	100.00% <100.00%> (+27.90%)	⬆️

... and 42 files with indirect coverage changes

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[Keith-CY]

This PR includes functional updates but the title starts with docs:, which will be misleading after merge.

[homura]

This PR includes functional updates but the title starts with docs:, which will be misleading after merge.

I've separated the codecov upgrade and dropped fs support for xpub store into other PRs