Icon edit code in sandbox

[AlitaBernachot]

📦 Add an icon to open and edit the example in code sandbox

Updated example pages (Work In Progress):

• [x] buildings.html
• [x] customProj.html => ⚠️ Working but overlay error: Request has failed. Status Code: 401 in Codesandbox
• [x] exports.html => ⚠️ Working but overlay error: Request has failed. Status Code: 401 in Codesandbox
• [x] fillstyle.html => ⚠️ Working but overlay error: Request has failed. Status Code: 401 in Codesandbox
• [x] groundvectors.html => ⚠️ Working but overlay error: Request has failed. Status Code: 401 in Codesandbox
• [x] icon-position.html => ⚠️
• [x] image-static.html => ⚠️
• [x] imageWMS.html => ⚠️
• [ ] kml.html => 🛑 Example not event working in standalone page, kml not available
• [ ] layer-group.html => 🛑 Example not event working in standalone page : Error for https://api.tiles.mapbox.com/v4/mapbox.world-borders-light.json?secure&access_token=pk.eyJ1IjoiZ2JvMiIsImEiOiJjazFraHV4N3gwZHliM2JucHYxdTNnNXh1In0.tzs3TxoVCaMNQf455mh-3w
• [x] lazy.html => ⚠️
• [x] main.html => ⚠️
• [x] mvt.html
• [x] overlay.html
• [ ] print.html => 🛑
• [ ] rastersync.html => 🛑 Example not event working in standalone page : Error for https://api.tiles.mapbox.com/v4/mapbox.world-borders-light.json?
• [x] rotate.html => ⚠️
• [ ] selection.html => 🛑
• [x] sidebyside.html => ⚠️
• [x] synthvectors.html => ⚠️
• [x] tracking.html
• [x] vectors.html => ⚠️ some feat. missing
• [x] wmts.html => ⚠️

⚡️ To improve:

• add a way to add special files according to the example (for now, all files are included for all examples)
• enable the inclusion of a css or a script in the html tag (instead of adding the tag in the html body
• remove the error overlay