Docs: Move image renderer doc to its own section and add configuration doc (#38759) (#39896)

* Move image renderer doc to its own section and add configuration doc

* revert unwanted changes

* remove unwanted formatting

* revert change

* Improve configuration section

* update default flags for 3.1.0 update

* Clean up and add some links

* fix broken links

* clean up notes & links and small updates

* fix after merge

* fix broken link

* fix typo

* Apply suggestions from code review

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>
Co-authored-by: Mitch Seaman <mjseaman@users.noreply.github.com>

* Apply PR feedback

* Update monitoring.md

* Apply suggestions from code review

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

* Update troubleshooting.md

* add alias for old image rendering doc page

Co-authored-by: Ursula Kallio <73951760+osg-grafana@users.noreply.github.com>
Co-authored-by: Mitch Seaman <mjseaman@users.noreply.github.com>
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
(cherry picked from commit b7eac0f655)

Co-authored-by: Agnès Toulet <35176601+AgnesToulet@users.noreply.github.com>
Co-authored-by: Agnès Toulet <agnes.toulet@gmail.com>

docs/sources/sharing/share-panel.md

@@ -26,7 +26,7 @@ To share a direct link:
 1. Send the copied URL to a Grafana user with authorization to view the link.
 1. You also optionally click **Direct link rendered image** to share an image of the panel.
 
-For more information, refer to the topic [Image rendering]({{< relref "../administration/image_rendering.md)" >}}).
+For more information, refer to the topic [Image rendering]({{< relref "../image-rendering/" >}}).
 
 Here is an example of a link to a server-side rendered PNG: