Fixes for dialog ui that accidently placed the ui itself into expected output. Tweaked the x-clacks header a bit to be better explained for those who may not know what it is.

.includes/nginx.sh

@@ -6,7 +6,7 @@ nginxSitesAvailable="/etc/nginx/sites-available"
 nginxSitesEnabled="/etc/nginx/sites-enabled"
 nginxDefaultSite="${nginxSitesAvailable}/default.conf"
 nginxDefaultSiteLink="${nginxSitesEnabled}/default.conf"
-clacksInfoUrl="https://www.gnuterrypratchett.com/"
+clacksInfoUrl="https://xclacksoverhead.org/home/about"
 nginxManagedInclude="include /etc/nginx/sites-enabled/*.conf;"
 
 nginx_installed() {
@@ -73,7 +73,7 @@ prompt_clacks_header() {
         return 1
     fi
 
-    msgbox "X-Clacks-Overhead is a tribute header inspired by Terry Pratchett's Clacks. For more information, visit ${clacksInfoUrl}"
+    msgbox "X-Clacks-Overhead is an optional tribute header inspired by Terry Pratchett's Clacks. Websites use it to remember names with values such as GNU Terry Pratchett. For more information, please see: ${clacksInfoUrl}"
     rawNames="$(inputbox "Enter a comma-separated list of names for the X-Clacks-Overhead header, or leave blank to skip.")" || return 1
     if [[ -z "${rawNames//[[:space:]]/}" ]]; then
         return 1