Remove github reference in README.md

Makefile

@@ -1,6 +1,6 @@
-# This Makefile was generated using MakeGen v1.3.8 made by Tim Håkansson
+# This Makefile was generated using MakeGen v1.3.9 made by Tim Håkansson
 # and is licensed under MIT. Full source of the project can be found at
-# https://github.com/Thraix/MakeGen
+# https://gitea.timha.se/Thraix/MakeGen
 CC=@g++
 CO=@g++ -o
 MKDIR_P=mkdir -p