Add note about inaccessibility

[HF]

On Thursday, 30 June 2022 at 19:20:58 CEST, Jookia wrote:
> All have significant flaws in accessibility compared to GitHub.
> 
> It would be nice to add a note that the trade-off for using these tools
> is excluding disabled people from your projects.

Might be good, but that should be a bit more specifc than just
>you will excluse disabled people
Like what exactly the issues are. Gitea did actually put work into 
accessibility recently.
https://github.com/go-gitea/gitea/issues/16660