* add support for up to 10 ESPNow remotes
* removed debug line
* changed todo comment
* fixed some issues, shortened html/java code
- reverting name to `linked_remote`
- ESPNow remote list is now hidden if unchecked
- shortened java script function names and variables to save flash
- removed now obsolete settings in xml.cpp
- correct checking of valid hex string for remote list in java script
* fixed indentation, using emplace_back instead of push_back, using JsonVariant, replaced buttons with +/-
* shortened java code
* updated java code, fixed bug
- element is now properly removed
- `+` button is hidden if list is full
- user needs to remove a remote, then reload the page to add it (workaround for edge case that needs more code to handle otherwise)
* add limit
* clearer usage description
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