* Clean up docs/examples - one directory per tutorial, more templating.
* Fix some URLs
* tutorials: update rendered CDN links to 1.0.0 and L.circle signature (#4975)
* Update shown CDN links to 1.0.0
As initially done in PR #4967, but just for the rendered links (what the users sees), as actual link / script tags are already updated.
* DOCS update L.circle to new syntax
in quick-start tutorial, following PR #4974.
* DOCS update L.circle to new syntak (example src)
updated L.circle to new signature (radius as an option instead of 2nd parameter).
* tutorials: use L.geoJSON new syntax (#4983)
* tutorials: use new syntax L.geoJSON
for consistency with recommended factory new syntax (`L.geoJSON` instead of legacy `L.geoJson`).
As done in PR #4933 for docstrings.
* tutorials: L.geoJSON new syntax in script
* Renamed several files to directory/index.md
