docs(docs): rebuild with more usage examples

Doxyfile

@@ -991,7 +991,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = src docs/static/mainpage.md
+INPUT                  = src docs/static/mainpage.md docs/static/usage.md
 
 # This tag can be used to specify the character encoding of the source files
 # that Doxygen parses. Internally Doxygen uses the UTF-8 encoding. Doxygen uses