Add Getting-Help screenshots and update docs
Add two Getting-Help screenshots and update documentation. Getting-Help.md: replace the screenshot placeholder with two images (About dialog and portal status bar) and clarify where version, framework and architecture are displayed. README.md: decrement screenshot placeholder counts and update the checklist to list the newly added Getting-Help screenshots.
Update docs: Portal toolbar is top toolbar
Replace references to the Portal footer toolbar with the top toolbar across documentation. Adjust related wording (search box, settings gear, theme toggle, Display Preferences, Wallpaper Cycling, Create dialog, screenshots) to reflect the toolbar being on the top navigation bar. Updated pages: Choosing-Engines, Create-Step-By-Step, Getting-Help, Managing-Library, Multi-Monitor, Portal-Interface-Tour, Quick-Start, README, Settings-General, Settings-Overview, Settings-Performance, Settings-Personal, Theme-Tray-Startup, Using-Store, Wallpaper-Cycling. These changes keep the docs consistent with the Portal UI relocation.