do not use mirrors for security repositories

Security updates should always be fetched directly from the security servers.
sample file, first 3 lines
Periods.
Exclamtion points and Second file
Stuff
Emphasize removal process for two-factor authentication
Updated StackScripts guide with UDF information.
Touch up description of information required to disable 2fa
Revert "Updating modify time for securing your server guide."

This reverts commit cab30e94e5d1580c4388b4ecf36e52a196698aef.
Revert "Updating securing your server guide to include longview within firewall"

This reverts commit c6350fc6cfe163fc4551df737a9b6ce718d6a9b0.
Revert "Adding note that firewall changes are only needed in the event that a firewall is utilized."

This reverts commit 020e47bcb5c037dd4ff297d49dbf6864cc11d8fd.
Revert "Adding firewall rules for Longview setup guide"

This reverts commit f41280a1a5902bca387bc781737f12b9b014645f.
My suggested edits to the additional StackScript info
Drupal 8 Guide
Drupal 8 Guide
Drupal 7 updates
Latest Drupal 8 guide
Latest Drupal 7 Guide
fixed broken path to SSL for CentOS guide
Fixing markdown for link to support email