Deprecate manual changelog

[fepegar]

This replicates what we did for hi-ml:

• Retire the manual changelog hi-ml#216

[fepegar]

Something happened with nbconvert in the Hello World test. @mebristo could you please verify that it's not our fault?

[fepegar]

Waiting for microsoft/hi-ml#265 to be merged.

[ant0nsc]

@fepegar, hi-ml has just been updated, can you add the latest main in the submodule?

[fepegar]

Waiting for #709 to be merged.

[ant0nsc]

@fepegar , I think we should then also add a build step that checks if the title matches the expected rules, like we did in hi-ml in microsoft/hi-ml#224? Were you planning to do that in a separate PR?

[fepegar]

@fepegar , I think we should then also add a build step that checks if the title matches the expected rules, like we did in hi-ml in microsoft/hi-ml#224? Were you planning to do that in a separate PR?

I think that's a good idea. Yes, I think we can add that after this has been merged, but I'm happy to add it here if you think it's easier.