[WIP] bootstrap5 + icons #184

Job	Run time
Validate coverage	21s
Functional Python 3 web tests	1m 6s
Build the documentation	22s
Lint the package	18s
Python: 3.7-x64 on ubuntu-latest	24s
Python: 3.7-x64 on windows-latest	1m 18s
Python: 3.7-x86 on windows-latest	2m 24s
Python: 3.7-x64 on macos-latest	42s
Python: 3.8-x64 on ubuntu-latest	19s
Python: 3.8-x64 on windows-latest	44s
Python: 3.8-x86 on windows-latest	2m 27s
Python: 3.8-x64 on macos-latest	26s
Python: 3.9-x64 on ubuntu-latest	32s
Python: 3.9-x64 on windows-latest	57s
Python: 3.9-x86 on windows-latest	1m 57s
Python: 3.9-x64 on macos-latest	39s
Python: 3.10-x64 on ubuntu-latest	28s
Python: 3.10-x64 on windows-latest	1m 7s
Python: 3.10-x86 on windows-latest	1m 8s
Python: 3.10-x64 on macos-latest	38s
Python: 3.11-x64 on ubuntu-latest	20s
Python: 3.11-x64 on windows-latest	1m 5s
Python: 3.11-x86 on windows-latest	1m 59s
Python: 3.11-x64 on macos-latest	26s
Python: pypy-3.8-x64 on ubuntu-latest	52s
Python: pypy-3.8-x64 on windows-latest	1m 38s
Python: pypy-3.8-x86 on windows-latest	2m 22s
Python: pypy-3.8-x64 on macos-latest	56s
Python: pypy-3.7- on ubuntu-latest	50s
	28m 45s

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