Remove Node 16 and 18

[DarkGL]

Node.js v16 and v18 already reached EOL

I want to propose removing support for node 16 and 18, it's already creating problem for us where we have to stay on older version of packages.

Also, v20 have require(esm)

If we still support v16 and v18 we can't use it event on never versions of node.

https://socket.dev/blog/require-esm-backported-to-node-js-20

@hoeck @moltar

[moltar]

Yes, I am ok with removing Node versions that are no longer supported.

[moltar]

As long as we can keep the historical data tho.

[DarkGL]

if we just remove CI part while leaving data files and frontend part it should be fine ?