More tutorials needed

The tutorials page needs some love. Leaflet has a lot of features, but there are tutorials for just a bunch of them.

We should spend some time converting some of the pages in the debug/ directory into tutorials/examples.

A non-comprehensive list:

• Complete newbie's guide to How To Use a Leaflet Plugin
• Image overlays (prettier version of image-overlay.html) https://github.com/Leaflet/Leaflet/pull/8090
• Map bounds (with bounceAtBounds)
• Layer opacity
• WMS (with special attention to Leaflet/WMS nomenclature about the term "layer")
• Fractional zoom controls (prettier version of zoomdelta.html)
• setView, setZoom, fitBounds and flyTo (prettier version of zoompan.html)
• L.CRS.Simple
• Custom CRSs (using, for example, a map of the galaxy with galactic CRS)
• A primer on how to create Leaflet plugins (L.Class, L.Class.include vs L.Class.extend, etc)
• Event propagation, and how to stop click events from reaching the map (this is going to be a FAQ)

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From #3271:

• Popular plugins (e.g. markercluster)
• Async data loading (e.g. server-side geojson)
• SVG markers (this might not be needed, if default markers are changed to SVGs)
• Custom events, event propagation
• Performance best practices (async Leaflet JS script loading, Performance-related content from FAQ)

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• Link to external tutorials (#1087)

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• How to dynamically reset the styles of Markers and CircleMarker and Polylines (setIcon, setOpacity, setStyle et al) (from #5084)

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• https://github.com/Leaflet/Leaflet/issues/8309

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• https://github.com/Leaflet/Leaflet/issues/7281

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Suggestions from this thread:

• Plugin tutorial: Fullscreen control (maybe add to/link from the mobile tutorial?)
• Tutorial for posAnimation
• "Security" guidelines