Move frontend nvmrc to /frontend/

[paskal]

Previously we had two .nvmrc files in two locations out of three using node.

[codecov]

Codecov Report

Base: 62.35% // Head: 62.35% // No change to project coverage 👍

Coverage data is based on head (b1caf44) compared to base (6ac7503).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1566   +/-   ##
=======================================
  Coverage   62.35%   62.35%           
=======================================
  Files         139      139           
  Lines        3421     3421           
  Branches      803      803           
=======================================
  Hits         2133     2133           
  Misses       1090     1090           
  Partials      198      198           

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[github-actions]

size-limit report 📦

Path	Size
public/embed.mjs	2.03 KB (0%)
public/remark.mjs	72.76 KB (0%)
public/remark.css	8.12 KB (+0.03% 🔺)
public/last-comments.mjs	35.67 KB (+0.01% 🔺)
public/last-comments.css	3.72 KB (0%)
public/deleteme.mjs	12.05 KB (0%)
public/counter.mjs	749 B (0%)

[akellbl4]

@paskal thanks for the good call and PR