Glob path import

[QuentinRoy]

Is your feature request related to a problem? Please describe.

I often organize my slides per section like the following:

.
├── pages
│   ├── 01-intro.md
│   ├── 02-variables.md
│   ├── 03-primitive-types.md
│   ├── 04-variable-scope.md
│   ├── 05-operators-and-control-flow.md
│   ├── 06-functions.md
│   ├── 07-objects.md
│   ├── 08-built-in-objects.md
│   ├── 09-classes.md
│   ├── 10-modules.md
|   └── 11-additional-syntax.md
└── slides.md

I then need to insert each of these sub files individually. If I later reorganize, e.g. move functions after objects in the example above, I'd rename the files so they are properly sorted, then I need to edit my main slides.md.

Describe the solution you'd like

It would be useful to be allowed to import slides using wildcards as follow:

___
src: "pages/*.md"
___

It would use natural ordering to insert each sections one after the other

Describe alternatives you've considered
Inserting each sub file individually.

[MeetRamatri]

I can try fixing implementing this, Kindly assign this to me @QuentinRoy @antfu @kermanx