Plugin Update Checks in .page

[Squidly271]

https://github.com/mstrhakr/plugin-docs/blame/547ed2b30863875f71788cd096fa80f84a2a8d5c/docs/ui/javascript-patterns.md#L677

Rather than the entire $.post, can be simplified to simply call caPluginUpdateCheck. see https://forums.unraid.net/topic/79010-ca-api-for-plugin-update-checks/#findComment-733420. function already included when the page is generated. No need to include files etc

[mstrhakr]

This should be fixed. Thanks!