Update Pixel server to Node 18

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It was pointed out to me that the server had my Node 18 branch checked out instead of main (iirc I didn't do it!)

I merged my Node 18 branch and checked out main on pixel on the server so we'd get updates that have been merged into main

I updated the server to use Node 18 via nvm

nvm install 18.17.0
nvm use 18.17.0
nvm alias default 18.17.0

I updated the cron job that runs pixel.sh to use 18

Updated the doc too:

https://wikitech.wikimedia.org/wiki/Pixel#su_crontab_-l

Update .nvmrc to Node 18
https://github.com/wikimedia/pixel/pull/262

Update Node from v16 to v18
https://github.com/wikimedia/pixel/pull/251