Get inspiration from Tchap Web V3

[jdauphant]

Some change can be retrieved from :
tchapgouv/tchap-web-v3@master...develop
and here for matrix-react-sdk :
https://github.com/tchapgouv/matrix-react-sdk-v3/compare/e70085ed2e14a74dc4f482645b89bbb82101de38...develop

Informations already extracted :

• As an user, in case my account have expirated, I want to be informed and have a process to reactivate my account #88 (comment)

[estellecomment]

Reading the whole v3 diff is difficult to understand and we will end up spending too much time on things that are not necessarily important.
However, when we know that we have to implement a feature, it will be useful to go see the v3 diff to learn from it.

[estellecomment]

@jdauphant ok to close ?

[jdauphant]

I have read quickly a quarter of it, I will read and extract what I found interesting, I may take me 1 or 2h.

[jdauphant]

Done with #88