Fleet desktop v1 announcement (#6723)

* remove reference to fleet desktop being in beta

* update how to generate a new Fleet Desktop installer

* document --disable-update and --desktop-channel flags

* new file for Fleet Desktop

* fleet desktop custom transparency link explanation

* docs for installing and upgrading Fleet Desktop

* fleet desktop out of beta announcement blog

* images

* copy edits

* convert headers to sentence case

* incorporate copy changes

* Updated images and meta tags

- I updated the images, and renamed to match our image naming conventions
- I added the article meta tags

* Update Fleet-desktop.md

* Specify Fleet Desktop document order

* Update to fleet-desktop-says-hello-world.md

- I added a screencast showing how to remediate a failing policy with Fleet Desktop
- I added inline styles so that the video fills the container width and renders correctly on mobile.
- I re-jigged "self remediation" and "Scope transparency" as H3 tags.

* address some typos and style changes

* update meta tag

* remove single quotes

* Update publishing date fleet-desktop-says-hello-world

Co-authored-by: Mike Thomas <mthomas@fleetdm.com>
Co-authored-by: Andrew Baker <89049099+DrewBakerfdm@users.noreply.github.com>

docs/Deploying/fleetctl-agent-updates.md

@@ -1,8 +1,10 @@
 # Self-managed agent updates 
 
-Fleet's [Orbit osquery updater](https://github.com/fleetdm/fleet/tree/main/orbit) by default utilizes the public Fleet update repository.
+[Orbit](https://github.com/fleetdm/fleet/tree/main/orbit) will periodically check the public Fleet update repository and update itself, Fleet Desktop, and/or osquery 
+if it detects a later version.
 
-For users who would like to self-manage an update server, this capability is available with a Fleet Premium subscription.
+To override this behavior, users can set a channel for each component or disable updates altogether. Visit [Adding Hosts](https://fleetdm.com/docs/using-fleet/adding-hosts#fleet-desktop) to learn more.
+Alternatively, users with a Fleet Premium subscription can self-manage an update server.
 
 ## Securing updates
 
@@ -158,4 +160,4 @@ fleetctl updates rotate targets
 
 After the key(s) have been rotated, publish the repository in the same fashion as any other update.
 
-<meta name="pageOrderInSection" value="400">
+<meta name="pageOrderInSection" value="400">