Add docs page with notable uses of sphobjinv

[bskinn]

People are using it -- huzzah! Might as well advertise the real-world uses!

Projects:

• [ ] Blender
• [ ] tensorflow-intersphinx & tensorflow-probability-intersphinx
• [ ] sphinx-autodoc-typehints
• [ ] opsdroid intersphinx skill
• [ ] steinwurf/versjon
• [ ] ARM-software/lisa
• [ ] alcarney/llyfrau
• [ ] jnbrunet/caribou (used as basis for own implementation)

Usage Examples:

• [ ] svenevs/exhale
• [ ] hyperspy
• [ ] jupyter-tutorial
• [ ] luk036/ellcpp (how similar is this to jupyter-tutorial?)
• [ ] arviz-devs/arviz (duplicate?)
• [ ] qucontrol/krotov (reloc?)
• [ ] ComPWA/tensorwaves (reloc?)

wemake Templates:

• [ ] Python package
• [ ] Django project

This is currently on the front page, but will be moved to a 'setup/installation' page as part of #270.

OS Distributions:

• Alpine Linux
• Arch Linux
• Fedora
• Gentoo
• NetBSD
• openEuler
• openSUSE