Add MaxBlogs config value

Plus update copy / options / templates in the config process.

config/funcs.go

@@ -0,0 +1,17 @@
+package config
+
+import (
+	"strings"
+)
+
+// FriendlyHost returns the app's Host sans any schema
+func (ac AppCfg) FriendlyHost() string {
+	return ac.Host[strings.Index(ac.Host, "://")+len("://"):]
+}
+
+func (ac AppCfg) CanCreateBlogs(currentlyUsed uint64) bool {
+	if ac.MaxBlogs <= 0 {
+		return true
+	}
+	return int(currentlyUsed) < ac.MaxBlogs
+}