refactor: implement component-based architecture for enhanced maintainability

- Reorganize directory structure into core/, features/, and themes/
- Colocate application Nix logic, configs, scripts, and theme overrides
- Implement 'Inversion of Control' for theming: apps now pull theme-specific layouts
- Update flake.nix and shared library paths to match the new structure
- Document the new Feature-Centric architecture in README.md

features/scripts/utils/nomarchy-notification-dismiss

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Dismiss a mako notification on the basis of its summary. Used by the first-run notifications to dismiss them after clicking for action.
+
+if (($# == 0)); then
+  echo "Usage: nomarchy-notification-dismiss <summary>"
+  exit 1
+fi
+
+# Find the first notification whose 'summary' matches the regex in $1
+notification_id=$(makoctl list | grep -F "$1" | head -n1 | sed -E 's/^Notification ([0-9]+):.*/\1/')
+
+if [[ -n $notification_id ]]; then
+  makoctl dismiss -n $notification_id
+fi