[SAC] Documenting sysadmin contracts in effect

[Regina Obe]

> I'm lost with sysadmin contracts.
> According to trac there are 2 open milestones named after contracts:
> 
>   - Sysadmin Contract 2023-I
>     https://trac.osgeo.org/osgeo/milestone/Sysadmin%20Contract%202023-I
> 
>   - Sysadmin Contract 2023-II
>     https://trac.osgeo.org/osgeo/milestone/Sysadmin%20Contract%202023-II
> 
> But I don't know who's in charge of taking care of them.
> 
> Should we use trac itself to document this ?
> Milestones can have a description so maybe that's the easiest thing to do
> 
I've put in the description of each milestone who has each contract.