Migrate Display & Interaction menu; drop version number from installer filename; bump to v2.0.0

- menus/display.sh: second menu migrated onto lib/menu.sh + lib/config.sh,
  covering touch gesture mode, link navigation security, and the
  pause/keyboard/navigation button toggles (previously three separate
  Core Settings entries). Deliberately a different shape from Sites
  (toggle list vs. list CRUD) to exercise the framework more broadly.
  Wired into install.sh's top-level menu alongside Sites.

- Renamed ubuntu-based-kiosk-v1.0.3.sh -> ubuntu-based-kiosk.sh so the
  installer can be updated in place instead of growing a new
  version-numbered filename every release; released versions are now
  tracked via git history and the in-script changelog. Updated all
  Readme download/re-run commands accordingly. Older versioned files
  (ubuntu-based-kiosk-v*.sh, install_kiosk_*.sh) are left in place as
  archived releases.

- Bumped SCRIPT_VERSION to 2.0.0 (new script-level changelog entry) and
  the Readme version/changelog to match, given the new modular
  management path, the rename, and the two real bugs fixed along the
  way (settings clobbered on save, off-by-one in reorder).

Verified before moving on to the web admin work:
- Regression: re-ran the full Sites scratch-config test suite (add,
  edit, delete, reorder, home) - still clean, no invalid-input paths hit.
- New: scratch-config test for every display.sh action (touch mode,
  navigation security, all three toggles), confirming values persist
  through save/reload and that a previously-added site survives
  untouched across Display-menu saves.
- End-to-end: ran the real install.sh (not just sourced functions) as a
  genuine non-root, non-"kiosk" user with real sudo, driving actual menu
  input through Sites -> add a page -> Display -> toggle a setting ->
  exit. Confirmed final config.json on disk matches every action taken,
  and both guard clauses (run as root; no installed kiosk found) fire
  correctly.

install.sh

@@ -10,8 +10,8 @@
 # lib/ and menus/, so a change to (say) the Sites menu can't accidentally
 # break WiFi setup or the uninstaller three thousand lines away.
 #
-# Today this only wires up the Sites & Page Timing menu (menus/sites.sh)
-# as a working proof of concept. The rest of Core Settings/Addons/Advanced
+# Today this wires up Sites & Page Timing (menus/sites.sh) and Display &
+# Interaction (menus/display.sh). The rest of Core Settings/Addons/Advanced
 # will move over the same way, one menus/*.sh file at a time.
 #
 # Usage (once the kiosk has already been installed):
@@ -30,6 +30,8 @@ source "$SCRIPT_DIR/lib/menu.sh"
 source "$SCRIPT_DIR/lib/config.sh"
 # shellcheck source=menus/sites.sh
 source "$SCRIPT_DIR/menus/sites.sh"
+# shellcheck source=menus/display.sh
+source "$SCRIPT_DIR/menus/display.sh"
 
 ################################################################################
 # Preflight
@@ -66,8 +68,8 @@ fi
 ################################################################################
 
 main_menu_builder() {
-    MENU_LABELS=("Sites & Page Timing")
-    MENU_HANDLERS=(sites_menu)
+    MENU_LABELS=("Sites & Page Timing" "Display & Interaction")
+    MENU_HANDLERS=(sites_menu display_menu)
 }
 
 main_menu_status() {