Study how to hide buttons on threads :

[odelcroi]

As our backend is not up to date, Threads are not ressource effective and might lead to problems.
We'd ratcher hide them for now.
As the feature flag has been removed in the next version of Element web, we need to study how to hide threads button.
Like :

• reply in a thread
• others?

Originally posted by @odelcroi in #443 (comment)

[odelcroi]

fixes : #462

[odelcroi]

We might want to want for the next element web upgrade before working on this issue

"Reply in thead" use :

[odelcroi]

#478