[WIP] bootstrap5 + icons #187

Job	Run time
Functional Python 3 web tests	1m 51s
Lint the package	19s
Validate coverage	23s
Build the documentation	29s
Python: 3.7-x64 on ubuntu-latest	34s
Python: 3.7-x64 on windows-latest	1m 33s
Python: 3.7-x86 on windows-latest	3m 12s
Python: 3.7-x64 on macos-latest	27s
Python: 3.8-x64 on ubuntu-latest	31s
Python: 3.8-x64 on windows-latest	1m 9s
Python: 3.8-x86 on windows-latest	2m 24s
Python: 3.8-x64 on macos-latest	27s
Python: 3.9-x64 on ubuntu-latest	25s
Python: 3.9-x64 on windows-latest	1m 11s
Python: 3.9-x86 on windows-latest	3m 8s
Python: 3.9-x64 on macos-latest	28s
Python: 3.10-x64 on ubuntu-latest	22s
Python: 3.10-x64 on windows-latest	1m 9s
Python: 3.10-x86 on windows-latest	2m 14s
Python: 3.10-x64 on macos-latest	29s
Python: 3.11-x64 on ubuntu-latest	29s
Python: 3.11-x64 on windows-latest	1m 35s
Python: 3.11-x86 on windows-latest	2m 13s
Python: 3.11-x64 on macos-latest	34s
Python: pypy-3.8-x64 on ubuntu-latest	1m 3s
Python: pypy-3.8-x64 on windows-latest	1m 41s
Python: pypy-3.8-x86 on windows-latest	2m 9s
Python: pypy-3.8-x64 on macos-latest	1m 13s
Python: pypy-3.7- on ubuntu-latest	50s
	34m 32s

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