Use elm-watch

[magopian]

Replace parcel with elm-watch

TODO:

• update Scalingo env vars: eg MATOMO_TOKEN -> VITE_MATOMO_TOKEN

[magopian]

So, this is now working correctly, BUT:

• no easy live-reloading on sass file change (we could hack something together using something like this but it's hairy)
• no easy way to use env vars (we need to use esbuild's define i guess)

In the current context, I'd say that elm-watch works well, but esbuild is less than ideal (at least for now, for us).

[magopian]

Ok, this should now be up for review @n1k0 , would you like to take it for a spin?
It seems to me that everything works as expected, bar one "detail": the scalingo build times out for some reason... The server SHOULD be running on the proper port and host, from my local tests, but still it fails. Do you have an idea what could cause that?

[lydell]

Really cool to see elm-watch used together with Vite!

[n1k0]

Several remarks at this point:

• Port used for dev server is 5173; this should be updated in README (or couldn't we juyst set it up to use 1234 as before?)
• elm-watch seems young and promising, but also prone to changes in a near future; wouldn't we want it to settle a little before leveraging it in production?
• The API page is broken
  
• matter of personal taste, but I really appreciated the all-inclusive, configuration-less approach of Parcel; in this patch, I find the configuration files are a little hard to understand

[n1k0]

Why removing this line? We don't want to version icomoon HTML demo files…

[n1k0]

Note that this triggers this warning in iTerm; maybe we should document it in README

[n1k0]

Also, running this command doesn't tell me at what URL the app is served; we should also document this in README (yes navigating helps, but it's easier if the user already knows)

[n1k0]

Nit: It's annoying these must be prefixed; no way to avoid it?

[lydell]

young and promising, but also prone to changes in a near future

Worked on it for 1.5 years, used it in production for 5 months. No changes are planned, only enhancements.

[n1k0]

This branch has diverged much while we'r epretty much happy with Parcel atm, so I'm gonna close this one.