Remove more MSVC 2015 workarounds and fix string_view checks #7611

	name: doc

	on: [push, pull_request]

	permissions:
	contents: read

	jobs:
	build:
	# Use Ubuntu 20.04 because doxygen 1.8.13 from Ubuntu 18.04 is broken.
	runs-on: ubuntu-20.04

	steps:
	- uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0

	- name: Add Ubuntu mirrors
	run: \|
	# Github Actions caching proxy is at times unreliable
	# see https://github.com/actions/runner-images/issues/7048
	printf 'http://azure.archive.ubuntu.com/ubuntu\tpriority:1\n' \| sudo tee /etc/apt/mirrors.txt
	curl http://mirrors.ubuntu.com/mirrors.txt \| sudo tee --append /etc/apt/mirrors.txt
	sudo sed -i 's~http://azure.archive.ubuntu.com/ubuntu/~mirror+file:/etc/apt/mirrors.txt~' /etc/apt/sources.list

	- name: Create build environment
	run: \|
	sudo apt update
	sudo apt install doxygen
	pip install mkdocs-material==9.5.25 mkdocstrings==0.25.1 mike==2.1.1
	cmake -E make_directory ${{runner.workspace}}/build
	# Workaround https://github.com/actions/checkout/issues/13:
	git config --global user.name "$(git --no-pager log --format=format:'%an' -n 1)"
	git config --global user.email "$(git --no-pager log --format=format:'%ae' -n 1)"

	- name: Build
	working-directory: ${{runner.workspace}}/build
	run: $GITHUB_WORKSPACE/support/mkdocs deploy dev

	- name: Deploy
	env:
	KEY: "${{secrets.KEY}}"
	if: env.KEY != '' && github.ref == 'refs/heads/master'
	working-directory: ${{runner.workspace}}/fmt/build/fmt.dev
	run: git push https://[email protected]/fmtlib/fmt.dev.git

Provide feedback