[ADD] events: added an event tracks doc

[ksc-odoo]

PROJECT TASK: https://www.odoo.com/web#id=3919221&cids=3&menu_id=4720&action=333&active_id=3835&model=project.task&view_type=form

This PR breaks down everything there is to know about Event Tracks and how to create them in Odoo Events. Completely new doc, new screenshots...etc.

This should be published/merged before the Track_Manage_Talks doc

[robodoo]

Pull request status dashboard.

[ksc-odoo]

Hey @tiku-odoo -- this one is ready for a Peer Review whenever you get a chance. Thanks 👍

[ksc-odoo]

Thanks for the always-helpful review, @tiku-odoo -- made all your suggested edits. 👍 This one is ready for a Final Review @StraubCreative -- whenever you get a chance... 🙏

[ksc-odoo]

Thanks for the feedback, @StraubCreative -- I made all the adjustments you requested, and am tagging you for another look (whenever you get the chance) Thanks! 👍

[StraubCreative]

@ksc-odoo to merge this in please address @larm-odoo feedback and pass to @samueljlieber after. Does not need another review from me, thank you!

[ksc-odoo]

Thanks for the feedback, @larm-odoo -- I made those suggested edits, and think this one is now ready for Tech Review @samueljlieber -- 👍

[ksc-odoo]

Thanks for the super-helpful feedback, @samueljlieber -- I really appreciate it. 🙏

@robodoo r+