Add more numbering options, update docs for that

config/config.tex

@@ -23,6 +23,9 @@
 % Configure definition, lemma, theorem, etc numbering behaviour. 1 = Individual, 2 = Combined (apart from Definition), 3 = Combined
 \setcounter{numberingConfig}{1}
 
+% Configure if for definitions, lemmas, etc, numbering should be (0) = <section>.<number> or (1) = <section>.<subsection>.<number> or (2) = <section>.<subsection>.<subsubsection>.<number>
+\setcounter{numberSubsections}{0}
+
 % Set the default language. 
 \setLang{en}