Update XR Deploying to android page for 4.4

[skyace65]

Updates the page to Godot 4.4. That said there's almost no 4.4 specific changes in this, that's really just the screenshots. Though the page hasn't been updated in a while and a lot has changed over the last two Godot releases, hence a bunch of changes and re-organizing.

I've done the following:

• Remove references to creating a debug.keystore file for android, that's done automatically in Godot 4.3 (Engine PR: Automatically generate the Android debug keystore godot#90611). Closes confusing/obsolete instruction in xr android deployment tutorial #10592
• Moved the warning about which render to use to the setup section. I don't think that it makes sense to have it later in the page.
• Removed the warning about the loaders plugin being renamed. If Bastiaan wants this back I'll re-add it, but I'm not sure how much value it provides right now
• Updated the text to say look for the 4.3 version of the plugin, last time I checked with Bastiaan he wasn't sure how they were going to handle renaming it for 4.4 hence leaving it like that
• Reword a section to avoid mentioning the specific plugin version, it's also now on 3.x instead of 2.x in terms of release number
• Remove the section on enabling the vendors plugin entirely, you don't need to do that anymore since it uses GDExtension
• rework the section on enabling a loader for better flow
• Remove the image showing Meta XR features you can enable. It's out of date and the plugin has so many features now you can't fit them all in a single screenshot
• Update text to reflect that there are Pico specific features now

[AThousandShips]

Suggested change

	The vendors plugin can be downloaded from the asset library, search for "OpenXR
	vendors" and install the one named "Godot OpenXR Vendors plugin for Godot 4.3".
	The vendors plugin can be downloaded from the asset library, search for "OpenXR vendors"
	and install the one named "Godot OpenXR Vendors plugin for Godot 4.3".

Better readability for the raw text

[skyace65]

Applied AThousandShips suggestion