Consolidate `DESCRIPTION.rst` and `README.md`

[leofang]

Indeed we're duplicating some of the information. It might take a few iterations to consolidate the two files and have something presentable on both PyPI and GitHub. Let's address this in the next release.

Originally posted by @leofang in #296 (comment)

[vzhurba01]

I'd like to extend the scope of this issue to help consolidate/organize all the README.md and DESCRIPTION.rst between cuda-python, cuda.bindings and cuda.core. When resolving issue #297 with PR 397 I found that cuda.bindings also has awkwardness in creating a consolidated file that is presentable on both PyPI and GitHub.

For PyPI, it seems like we'd want:

• To direct users to documentation
• Runtime dependencies
• Installing? (Perhaps a link to installing page in documentation is better)

For GitHub:

• Same as PyPI
• Development info
• Running tests, samples and benchmarks

There's some overlap in dev info across subpackages that may belong better under cuda-python:

• Code Linting
• Code Signing
• Supported Python Versions

In conclusion, info that applies to all subpackages should be under cuda-python while development info specific to a subpackage should be kept out of PyPI.

[leofang]

Sounds like a plan! You have earned the title "trusted assignee," Vlad 👍

[leofang]

cc @rwgk for vis