* Update Applications tab screenshots
Replace outdated install/uninstall/show-installed screenshots and add
new ones for upgrade-all, clear-selection, selected-apps counter, and
collapse/expand categories.
* Update Applications guide with new screenshots and sections
Point each tab at its refreshed screenshot, reorder tabs to match the
sidebar button order in the app, and document the Upgrade All,
Selected Apps counter, and Collapse/Expand Categories controls.
* Add missing Updates tab screenshot
The image was referenced by the Updates guide but was never checked
into the repo.
* Reorder screenshots to follow their intro paragraph
Move the tab screenshot below the introductory text on the Tweaks and
Updates guide pages, matching the paragraph-then-screenshot layout
used elsewhere in the docs.
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Co-authored-by: Chris Titus <contact@christitus.com>
