[nix] fix bin/install (add esbuild, fix sass)

Now everything uses a nix flake
2 jobs for 701-dev-fix-nix-build in 8 minutes and 35 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Compile
failed #15081
compile

00:08:35

 
  Test
skipped #15082
test
 
Name Stage Failure
failed
compile Compile
    at connectImpl (file:///builds/gargantext/purescript-gargantext/node_modules/spago/bin/bundle.js:100428:12)
at file:///builds/gargantext/purescript-gargantext/node_modules/spago/bin/bundle.js:100669:12
at runSync (file:///builds/gargantext/purescript-gargantext/node_modules/spago/bin/bundle.js:60795:21) {
code: 'ERR_DLOPEN_FAILED'
}

Node.js v20.12.2
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1