Allow the *.typ file to be called something other than main.typ

Enivex

This caused massive headaches for me ;) At the very least, this limitation should be written clearly somewhere.

Cubxity

This is possible, but currently undocumented. It is possible to set the path to the main file in `.typstudio/config.json`.

Enivex

> This is possible, but currently undocumented. It is possible to set the path to the main file in `.typstudio/config.json`. Do I have to create the file myself? I wasn't able to find it. Anyway, ideally it would detect what the main file is. Especially if there's only a single .typ file in the folder.

Cubxity

Yes, you have to manually create the file for the time being. There will be a user-friendly way to set this in the GUI in the future. An example of `config.json`: ```json { "main": "main.typ" } ```

caoimhebyrne

> There will be a user-friendly way to set this in the GUI in the future. We should add a warning that appears when trying to compile without a `main.typ`, and it will then ask "Do you want to mark the current file as the main typst file?", if the user selects yes, we will write the `config.json` for them/make changes to it. We could also: - Add a context menu action to files that allows the user to mark it as the main typst file - Add a project creation wizard which will create a `main.typ` file automatically with some boilerplate within it What do you think of these suggestions @Cubxity?