'make docs' does not open HTML docs in a browser to avoid SegFault.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

Makefile

@@ -97,7 +97,7 @@ docs: ## generate Sphinx HTML documentation, including API docs
 	$(MAKE) -C docs html
 		#$(MAKE) -C docs latex
 #	$(MAKE) -C docs latexpdf
-	$(BROWSER) docs/_build/html/index.html
+	#$(BROWSER) docs/_build/html/index.html
 
 servedocs: docs ## compile the docs watching for changes
 	watchmedo shell-command -p '*.rst' -c '$(MAKE) -C docs html' -R -D .