revert pandoc

Author: Borda

requirements/docs.txt

@@ -2,7 +2,7 @@ sphinx >5.0, <6.0
 myst-parser >=0.18.1, <3.0.0
 nbsphinx >=0.8.5, <=0.9.2
 nbconvert <7.14  # temporary fix for https://github.com/jupyter/nbconvert/issues/2092
-pandoc >=2.14.2, <4.0.0
+pandoc >=1.0, <=2.3
 docutils >=0.16, <0.21
 sphinxcontrib-fulltoc >=1.0, <=1.2.0
 sphinxcontrib-mockautodoc