up node version

[akellbl4]

• use latest LTS
• add nvmrc
• recommend NVM for version auto switch

[codecov]

Codecov Report

Merging #1403 (e04bd66) into master (24e9404) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1403   +/-   ##
=======================================
  Coverage   57.88%   57.88%           
=======================================
  Files         130      130           
  Lines        2885     2885           
  Branches      741      741           
=======================================
  Hits         1670     1670           
  Misses       1211     1211           
  Partials        4        4           

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
public/embed.mjs	2.02 KB (0%)	41 ms (0%)	325 ms (+23.02% 🔺)	365 ms
public/remark.mjs	70.82 KB (0%)	1.5 s (0%)	837 ms (-18.91% 🔽)	2.3 s
public/remark.css	8.2 KB (0%)	165 ms (0%)	0 ms (+100% 🔺)	165 ms
public/last-comments.mjs	35.62 KB (+0.01% 🔺)	713 ms (+0.01% 🔺)	843 ms (+103.45% 🔺)	1.6 s
public/last-comments.css	3.79 KB (+0.03% 🔺)	76 ms (+0.03% 🔺)	0 ms (+100% 🔺)	76 ms
public/deleteme.mjs	10.01 KB (0%)	201 ms (0%)	192 ms (-13.19% 🔽)	393 ms
public/counter.mjs	749 B (0%)	15 ms (0%)	278 ms (-1.54% 🔽)	293 ms