Add stubby MapLibre shell using local style and tiles resources

[migurski]

Introduces examples/local.html, distinct from other examples by using generated output of styles and tiles to serve a map. Meant for users of Basemaps repo who intend to build their Styles & Tiles and need a way to see those results in a simple browser shell to copy/paste into their own sites or apps.

Distinct from /app by not introducing a server component, showing how static resources alone can define a useable map.

To use local font and sprite files from basemap-assets, we include a new submodule.

Example sequence to generate and display in a browser:

cd tiles
docker build -t protomaps/basemaps .
docker run -v ./data:/tiles/data --rm -it protomaps/basemaps --output=data/monaco.pmtiles --area=monaco --force
cd -

cd styles
npm run generate_style style.json https://example.com/tilejson.json light en
cd -

git submodule init
git submodule update

open http://localhost:8080/examples/local.html
npx http-server -p 8080 -c-1

Result:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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