Change port of "make livehtml" to 8050

Author: ksuess

Makefile

@@ -221,6 +221,7 @@ deploy: clean html
 livehtml: deps  ## Rebuild Sphinx documentation on changes, with live-reload in the browser
 	cd "$(DOCS_DIR)" && ${SPHINXAUTOBUILD} \
 		--ignore "*.swp" \
+		--port 8050 \
 		-b html . "$(BUILDDIR)/html" $(SPHINXOPTS) $(O)
 
 .PHONY: netlify