upgrade docs build system about crate-dbal

[amotl]

Thanks @mechanomi. I just added the docs-ng build system on behalf of #109.

[infoverload]

I am interested in this

[nomicode]

@infoverload go for it. however, this work is currently blocked on https://github.com/crate/tech-writing-domain/issues/97 -- happy to work on that with you though and figure out a solution

[amotl]

Hi there,

I've identified those tasks:

• Don't use buildout, just use a Makefile
• Bump dependency versions of Sphinx, etc.
• Add documentation build to CI

With kind regards,
Andreas.

[nomicode]

@amotl did you check out crate/crate-howtos#163? (the tasks outlined on that issue are probably a useful template for this issue)