FEATURE: Show category/sub-category events on calendar category header (add eventsFromCategory parameter in categorySetting of admin plugin settings)

[ledadu]

Add eventsFromCategory feature from categorySetting

Commit : f786cc1
This add parameter to 'categorySetting' in /admin/site_settings/category/all_results?filter=plugin%3Adiscourse-calendar
example : categoryId=4;eventsFromCategory=4
This parameter add a calendar to the top of the 'categoryId' page, and fetch all events in the 'eventsFromCategory' category and sub category

Events is in topics of the category and sub-caegory.
(In future, maybe the option 'eventsFromCategory' can take an array of categoryID, and an option to not use sub-categories)

[ledadu]

@lis2
Hello.

[jjaffeux]

I will start reviewing this next week.

[ledadu]

I will start reviewing this next week.

Great! thank you. :)