[file-server] Add "from" parameter to browse complementary to "limit"

[cceyda]

A simple update to the browse functionality within the file-server

• Added an optional from URL parameter complementary to the existing limit parameter.

Use case -> To efficiently browse folders with many... many... files

Usage

caddy file-server --listen 8000 --browse

http://localhost:8000/browse
Shows all files

http://localhost:8000/browse?limit=10
Shows only files 10 files starting from 0

http://localhost:8000/browse?limit=10&from=5
Shows only files 10 files starting from 5

[CLAassistant]

All committers have signed the CLA.

[francislavoie]

I think offset would be better than from.

[mholt]

Thanks for the PR! I'll try to give it a pass soon.

[cceyda]

I think offset would be better than from.

that's reasonable too, should I change it?

[mholt]

Thanks, LGTM! Except changing to offset sounds like a good idea. Although "from" isn't bad, "offset" makes a little more sense I think.

[cceyda]

looks good

[mholt]

Cool, thanks!