Change Sourceforge URLs/notes to GitHub

Except the donate URL ofc

	modified:   htdocs/SSI-HTML/docs/docswarn.html
	modified:   htdocs/SSI-HTML/download_box.html
	modified:   htdocs/SSI-HTML/hotlinks_box.html
	modified:   htdocs/community.html
	modified:   htdocs/docs/cubeengine.html
	modified:   htdocs/docs/faqs.html
	modified:   htdocs/docs/getstarted.html
	modified:   htdocs/docs/history.html
	modified:   htdocs/docs/knownissues.html
	modified:   htdocs/docs/license.html
	modified:   htdocs/docs/mapediting2.html
	modified:   htdocs/docs/mapediting3.html
	modified:   htdocs/docs/mapediting4.html
	modified:   htdocs/docs/mapediting5.html
	modified:   htdocs/docs/mapediting6.html
	modified:   htdocs/docs/playerskins.html
	modified:   htdocs/download.html
	modified:   htdocs/uninstallnotes/v1.0/index.html
	modified:   htdocs/uninstallnotes/v1.1/index.html
	modified:   htdocs/uninstallnotes/v1.2/index.html