Update mkdocs-material-insiders (#1657)

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,14 +1,18 @@
-<!-- Please use a descriptive title for your PR, it will be included in our changelog -->
+<!-- READ ENTIRELY BEFORE SUBMITTING:
+Please use a descriptive title for your PR, it will be included in our changelog!
 
-Resolves: # <!-- Did you solve an open GitHub issue? Put the number here so we mark it complete! -->
+**********
+By submitting a PR, you are agreeing to release your work to the public domain
+persuant to the terms described in our LICENSE file (CC0 1.0 Universal).
+**********
 
-<!--
 Please share with us what you've changed.
 If you are adding a software recommendation, give us a link to its website or
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-disclose this as well:
+disclose this as well (this does not disqualify your PR by any means):
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 Conflict of interest contributions involve contributing about yourself,
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@@ -16,7 +20,7 @@ Any external relationship can trigger a conflict of interest.
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