Revert "workflows: Point to https://www.klipper3d.org/Contact"

This reverts commit d14015111e30a8a58cbd9c97a2af4446048a15b7.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,7 +1,7 @@
 blank_issues_enabled: false
 contact_links:
   - name: Directions
-    url: https://www.klipper3d.org/Contact
+    url: https://www.klipper3d.org/Contact.html
     about: Have a question? Need help? Start here.
   - name: Klipper Forum
     url: https://community.klipper3d.org/

.github/ISSUE_TEMPLATE/custom.md

@@ -3,4 +3,4 @@ name: Create a Klipper github issue
 about: Working on improving Klipper? Provide an update on your work here.
 ---
 <!-- Directions have recently changed. Do not open this ticket without
- following the directions at: https://www.klipper3d.org/Contact -->
+ following the directions at: https://www.klipper3d.org/Contact.html -->

.github/workflows/invalid-label-bot.yaml

@@ -18,7 +18,7 @@ jobs:
                 + " Many helpful people will not see your message here and you"
                 + " are unlikely to get a useful response."
                 + " Instead, see the contact directions at:"
-                + " https://www.klipper3d.org/Contact"
+                + " https://www.klipper3d.org/Contact.html"
                 + "\n\n"
                 + "We use github to share the results of work done to"
                 + " improve Klipper. We don't use github for requests."
@@ -27,7 +27,7 @@ jobs:
                 + " problems with a printer.)"
                 + "\n\n"
                 + "Please follow the directions at:"
-                + " https://www.klipper3d.org/Contact"
+                + " https://www.klipper3d.org/Contact.html"
                 + "\n\n"
                 + "This ticket will be automatically closed."
                 + "\n\n"