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Fix supporting mutable whenCreated with unmounting MapContainer.

Fix removing the map handlers when MapContainer is unmounted.

• Fix tooltip position (PR #939 by simonasdev).
• Fix attribution URLs and use HTTPS in docs (PR #930 by jpstotz).

Fix layer unmount (PR #916 by piitaya).

• Fix Popup unmounting logic to unbind from container.
• Fix links to point to Leaflet 1.7.1 docs (PR #889 by zerekw).

• Change unmounting logic for some layers, which should fix issues related to removing or updating elements.
• Make the style prop of GeoJSON mutable, this prop should be used instead of pathOptions (pathOptions can still be used but should be considered deprecated).
• Fix documentation about bounds prop being an instance of LatLngBounds.

• Make Pane component compatible with React's StrictMode (PR #810 by zmbc)
• Fix typo in API Components docs (PR #827 by arthurdenner)

Use useState hook rather than useMemo to store immutable values in MapContainer and Pane.

• Document pathOptions for GeoJSON (PR #785 by bb)
• Ensure MapContainer props are immutable
• Fix TypeScript definition for MapContainer props
• Update README

Additional fixes for panes support