Rename Advanced Tools to Development Tools

[erlend-aasland]

Also relocate to between Testing & Buildbots and Core Developers

As suggested by @CAM-Gerlach in #1148 (comment):

Advanced Tools is another option to consider, as it specifically covers how to use various tools for CPython development, so is at least nominally the most on-topic. It currently mostly focused on "advanced" tools (like GDB, Clang dynamic analysis, and Coverity) that won't be used by most CPython developers, so folks might not think to look there first. However, a rename to "Development Tools", a move to between Testing and Buildbots and Core Developers, and putting the Argument Clinic guide in the section first might help address that, as well as be a good spot for similar such guides in the future.

Therefore, my preference would be for Development Tools (Advanced Tools) with the changes suggested above.

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📚 Documentation preview 📚: https://cpython-devguide--1149.org.readthedocs.build/

[erlend-aasland]

@hugovk, should I also do something with the redirects dict? (Would it be possible to link from the old URL to the new URL?)

[erlend-aasland]

@CAM-Gerlach, since you requested this change: are you fine with this PR as it stands?

[erlend-aasland]

Thanks, y'all