Merge branch 'maj_doc6' into 'master'

Maj docs requirements

See merge request espace-dev/sen2chain!54

docs/requirements.txt

 #requirements for rtd building
-sphinx==4.5.0
-sphinx_rtd_theme==1.1.1
-readthedocs-sphinx-search==0.1.1
-sphinx-math-dollar==1.2.1
-myst_parser==0.18.1
-sphinx-book-theme==0.3.3
+sphinx~=4.5.0
+sphinx_rtd_theme~=1.1.1
+readthedocs-sphinx-search~=0.1.1
+sphinx-math-dollar~=1.2.1
+myst_parser~=0.18.1
+sphinx-book-theme~=0.3.3