feat: customizable themes (#92)

* feat: configurable basic layout

* fix: added missing layouting infor for github

* feat: forgotten to commit the changed preamble

slides/common/preamble.tex

@@ -52,15 +52,15 @@
 \setbeamersize{text margin left=0.5cm, text margin right=0.5cm}
 
 \setbeamercolor{structure}{<++layout.beamercolor_structure++>}% to modify  immediately all palettes
-\setbeamercolor{title}{fg=UniRot}
-\setbeamercolor{title in head/foot}{fg=UniRot}
+\setbeamercolor{title}{<++layout.beamercolor_title++>}
+\setbeamercolor{title in head/foot}{<++layout.beamercolor_title_head++>}
 
-\setbeamercolor{block title}{bg=UniRot!20,fg=darkred}
-\setbeamercolor{block body}{fg=black, bg=plightgrey2}
+\setbeamercolor{block title}{<++layout.beamercolor_block_title++>}
+\setbeamercolor{block body}{<++layout.beamercolor_block_body++>}
 
 % \setbeamercolor{block title}{fg=white,bg=orange}
-\setbeamercolor{block title alerted}{fg=white,bg=UniRot}
-\setbeamercolor{block title example}{fg=white,bg=PineGreen!80}
+\setbeamercolor{block title alerted}{<++layout.beamercolor_block_title++>}
+\setbeamercolor{block title example}{<++layout.beamercolor_block_title++>}
 
 
 % enables two line cols in tabular envs