commands: Use example.com as homepage for new theme

The fictional siteforthistheme.com domain has been
squatted by Afternic of GoDaddy since November 2016...

Author: anthonyfok

commands/new.go

@@ -344,7 +344,7 @@ name = "` + strings.Title(helpers.MakeTitle(filepath.Base(inpath))) + `"
 license = "MIT"
 licenselink = "https://github.com/yourname/yourtheme/blob/master/LICENSE.md"
 description = ""
-homepage = "http://siteforthistheme.com/"
+homepage = "http://example.com/"
 tags = []
 features = []
 min_version = "0.24"