move common sty to sphinx

common.sty

+\usepackage{lastpage}     % for "page n of m" feature
+\usepackage{pdfpages}     % for inline inclusion of pdfs
+\usepackage{pdflscape}    % for making pages landscape (so included pdfs can still get figure names and header/footer)
+\RequirePackage{fancyhdr} % because howtos don't require it
+
+% remove blank pages that are a result of a twopage document class
+\let\cleardoublepage\clearpage
+
+% howtos are not fancy by default
+\pagestyle{normal}
+
+% for box drawing
+\usepackage{pmboxdraw}