DOCS: Revert changes to use webp #355

Job	Run time
Documentation style check	31s
Check the title of the pull request	5s
Build wheelhouse and smoke tests (ubuntu-latest, 3.7)	2m 58s
Build wheelhouse and smoke tests (ubuntu-latest, 3.8)	2m 25s
Build wheelhouse and smoke tests (ubuntu-latest, 3.9)	2m 35s
Build wheelhouse and smoke tests (ubuntu-latest, 3.10)	2m 51s
Build wheelhouse and smoke tests (ubuntu-latest, 3.11)	2m 54s
Build wheelhouse and smoke tests (windows-latest, 3.7)	3m 59s
Build wheelhouse and smoke tests (windows-latest, 3.8)	7m 0s
Build wheelhouse and smoke tests (windows-latest, 3.9)	5m 15s
Build wheelhouse and smoke tests (windows-latest, 3.10)	4m 20s
Build wheelhouse and smoke tests (windows-latest, 3.11)	4m 28s
Documentation build without examples	17m 46s
Documentation build with examples	0s
Testing and coverage (Linux)	1s
Testing IronPython and coverage (Windows)	1m 16s
Testing solvers and coverage (Linux)	1s
Testing solvers and coverage (Windows)	30m 25s
Testing and coverage (Windows)	29m 3s
Package library	1s
Release project	1s
Upload release documentation	1s
Deploy stable docs index	1s
	1h 57m 57s

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