wiki: make TTY baseline the primary example, remove baseline config page
Restored Example-TTY-Baseline.md as the primary walkthrough.
Deleted Example-Baseline-Config.md.
Updated all references across the wiki from examples/config.lua
to examples/tty-baseline.lua.
wiki: remove hidden example configs from navigation
Only baseline (config.lua) and tiling remain as tracked examples.
Deleted walkthrough pages: Freeform-Move, Snap-Grid, Clump, Nested-Debug, TTY-Baseline.
Updated all overviews, sidebars, and guides to reference only the 2 remaining examples.
Shared helpers page (common.lua, rules.lua) is kept.