URLs in `package.json` may now be specified relative to the base URL of the
`package.json` file.
Relative URLs wil work for `package.json` files installed from the web as
well as local file paths.
Docs: update `docs/reference/packages.rst` to add documentation for:
- Installing packages from local filesystems (PR #12476); and
- Using relative URLs in the `package.json` file (PR #12477);
- Update the packaging example to encourage relative URLs as the default
in `package.json`.
Add `tools/mpremote/tests/test_mip_local_install.sh` to test the
installation of a package from local files using relative URLs in the
`package.json`.
Signed-off-by: Glenn Moloney <glenn.moloney@gmail.com>
2992e34956