Installation is documented in at least 4 places:

• users/installing
• contributing/retrieve latest version of source install
• FAQ/Installation
• https://github.com/matplotlib/matplotlib/blob/master/INSTALL.rst

which can lead to them being out of sync, as seen by the issues targeting only one page in the docs, and can make it harder for new users (especially new contributors) to figure out which instructions they're supposed to be following. I propose the docs get consolidated down to one installation page, the section from the FAQ be removed, and that the developer docs & install.rst should cross link to that install page.

In the process of consolidating the docs, the following issues should probably also at least be addressed:

• Update virtualenv + OSX + conda guide #6418 Update virtual env+osx+conda docs
• Document windows build using conda #8652 Windows build using conda
• Setting alpha on legend handle changes patch color #11702 Installing from source on windows
• Re-opening Definitive Docs for compilation on Windows. #7418 Definitive Docs for Compilation on Windows
• Improve dev installation documentation #14755 uninstall existing versions of matplotlib
• document where nightly wheels are published #9994 Document nightly wheels location