👔 Move GitHub templates, update README (#24199)

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,20 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 📖 Marlin Documentation
+    url: https://marlinfw.org/
+    about: Lots of documentation on installing and using Marlin.
+  - name: 👤 MarlinFirmware Facebook group
+    url: https://www.facebook.com/groups/1049718498464482
+    about: Please ask and answer questions here.
+  - name: 🕹 Marlin on Discord
+    url: https://discord.gg/n5NJ59y
+    about: Join the Discord server for support and discussion.
+  - name: 🔗 Marlin Discussion Forum
+    url: https://reprap.org/forum/list.php?415
+    about: A searchable web forum hosted by RepRap dot org.
+  - name: 📺 Marlin Videos on YouTube
+    url: https://www.youtube.com/results?search_query=marlin+firmware
+    about: Tutorials and more from Marlin users all around the world. Great for new users!
+  - name: 💸 Want to donate?
+    url: https://www.thinkyhead.com/donate-to-marlin
+    about: Please take a look at the various options to support Marlin Firmware's development financially!