add docs on reducing pr noise (#2475)

Author: motatoes

docs/ce/howto/noise-reduction.mdx

@@ -0,0 +1,18 @@
+---
+title: Reducing PR Noise
+---
+
+The current behaviour of digger is that it leaves a comment for every plan or apply performed. It also leaves a summary comment on top of those.
+While this is noise to see a quick history of activity within the PR, it gets noisy for anything over 10 impacted projects.
+
+In such cases you can disable the reporting entirely using digger.yml:
+
+```
+reporting:
+  comments_enabled: false
+```
+
+With that in place you will no longer see an individual plan per comment, you can go into the checks page to see the individual plans
+
+
+![](/images/howto/checks.png)

docs/docs.json

@@ -90,6 +90,7 @@
           {
             "group": "How To",
             "pages": [
+              "ce/howto/noise-reduction",
               "ce/howto/specify-terraform-version",
               "ce/howto/caching-strategies",
               "ce/howto/apply-on-merge",