[DOC] Update community support channels to include Discord

[hadifawaz1999]

removing slack links replacing by discord

[aeon-actions-bot]

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I have added the following labels to this PR based on the title: [ documentation ].

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[SebastianSchmidl]

Please also reference Discord in our GitHub templates and automation (in ´.github´) and the following file:

aeon/docs/conf.py

Lines 243 to 244 in 5b75f34

	"name": "Slack",
	"url": "https://join.slack.com/t/aeon-toolkit/shared_invite/zt-3ihx5vif8-SwFzy1unNNMeQueC84MXVA", # noqa: E501