DOCS: Revert changes to use webp #360

Job	Run time
Documentation style check	27s
Check the title of the pull request	3s
Build wheelhouse and smoke tests (ubuntu-latest, 3.7)	2m 14s
Build wheelhouse and smoke tests (ubuntu-latest, 3.8)	2m 29s
Build wheelhouse and smoke tests (ubuntu-latest, 3.9)	3m 48s
Build wheelhouse and smoke tests (ubuntu-latest, 3.10)	2m 50s
Build wheelhouse and smoke tests (ubuntu-latest, 3.11)	2m 50s
Build wheelhouse and smoke tests (windows-latest, 3.7)	4m 17s
Build wheelhouse and smoke tests (windows-latest, 3.8)	4m 0s
Build wheelhouse and smoke tests (windows-latest, 3.9)	4m 14s
Build wheelhouse and smoke tests (windows-latest, 3.10)	5m 3s
Build wheelhouse and smoke tests (windows-latest, 3.11)	4m 16s
Documentation build without examples	17m 29s
Documentation build with examples	0s
Testing and coverage (Linux)	37m 33s
Testing solvers and coverage (Linux)	43m 35s
Testing solvers and coverage (Windows)	30m 20s
Testing IronPython and coverage (Windows)	1m 26s
Testing and coverage (Windows)	24m 18s
Package library	32s
Release project	0s
Upload release documentation	0s
Deploy stable docs index	0s
	3h 11m 44s

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