update document structure

.gitignore

-
-.vscode/
 .aux/
-build/
 *.synctex.gz
 *.synctex(busy)
 *.log

data/code/README.md

+# Source-code folder
+
+This folder is for source-code you want to use in your document.
+Maybe you just want it here to be able to easily open and reference it,
+but you can also include and print it into your document (with syntax-highlighting).
+Use the `lstings` package for that.

data/code/main.c

+#include <stdio.h>
+
+int main(int argc, char* argv[]){
+	printf("This is %s\n", argv[0]);
+	return 0;
+}

src/config.tex → src/HsH-classes.cfg

-%% Meta Data for the PDF file
-\@ifpackageloaded{hyperref}{
-  \hypersetup{
-    pdfinfo={
-      Title={\@title},
-      Author={\@author},
-      Subject={\@subject},
-      Keywords={\@keywords}
-    }
-  }
-}{}
 %% configs for optional packages:
 \@ifpackageloaded{biblatex}{
   \ExecuteBibliographyOptions{