Review "instance"/"instance options" terminology

[guimachiavelli]

@dichotommy has pointed out "instance options" can be a rather opaque term. This is connected to the fact that "instance" itself is far from clear to new users.

I think there are two things to discuss here:

1. How and when should we use "instance"? It is a handy and useful term, so I wouldn't want to drop it completely, but it seems useful to have usage guidelines;
2. How can we refer to what we currently call "instance options"? @dichotommy previously suggested "global arguments". I'm afraid global can have some negative connotations, but would be interested in the core team's thoughts on this (pinging @curquiza)
   • Should we drop "instance options" completely? Or should we use it in conjunction with other term(s)?

[curquiza]

To be honest, I don't know what is common. I personally use "flag" or "options" to talk about --XXX options, and for me it's indeed "Meilisearch flag/options", not "instance"

I also ping @Kerollmops who maybe have a different opinion than me.

[curquiza]

Discussed with @guimachiavelli Not something we want to do: we don't have time to make a decision about this, what we should do and why? Is it valuable for users? Feel free to let us know if something is missing by re-opening a new issue 😊