fix(datasheet): broken links to git / extra docs

docs/doc_template.md

@@ -4,10 +4,10 @@
 
 * Author: {author}
 * Description: {description}
-* [GitHub repository]({git_url})
+* [GitHub repository](__git_url__)
 * {project_type} project
 * Mux address: {mux_address}
-* [Extra docs]({doc_link})
+* [Extra docs](__doc_link__)
 * Clock: {clock_hz} Hz
 * External hardware: {external_hw}
 

documentation.py

@@ -104,7 +104,11 @@ class Docs():
 
                 # now build the doc & print it
                 try:
-                    doc = doc_template.format(**yaml_data)
+                    doc = (doc_template
+                        .replace('__git_url__', '{git_url}')
+                        .replace('__doc_link__', '{doc_link}')
+                        .format(**yaml_data)
+                    )
                     fh.write(doc)
                     fh.write("\n\clearpage\n")
                 except IndexError: