Docs: Adds plugin signature verification pages (#25257)

Co-authored-by: Kyle Brandt <kyle@grafana.com>
Co-authored-by: Marcus Olsson <accounts+github@marcus.se.net>

docs/sources/developers/plugins/sign-a-plugin.md

@@ -0,0 +1,10 @@
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+title = "Sign a plugin"
+type = "docs"
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+
+# Sign a plugin
+
+Signing a plugin allows Grafana to [verify the authenticity of the plugin]({{< relref "../../plugins/plugin-signature-verification.md" >}}) and by that give users a way to make sure plugins haven't been tampered with. All Grafana Labs authored backend plugins, including Enterprise plugins, are signed.
+
+We're looking into providing a process for allowing community plugins to be signed in an upcoming version of Grafana.