Make flake self-contained - consolidate installer-replication

BREAKING CHANGE: Remove external dots-hyprland dependency

- Imported all essential configs from dots-hyprland/installer-replication
- Added complete configs/ directory with:
  - hypr/ - Hyprland configuration
  - quickshell/ - Quickshell widgets and config
  - applications/ - Application configurations
  - scripts/ - Utility scripts
  - matugen/ - Material You theming
- Updated flake.nix to use local ./configs instead of external repo
- Simplified update-flake script (removed external repo management)
- Updated README to reflect self-contained architecture
- All builds pass with local configurations

Benefits:
- No external repository dependencies
- Faster builds (no network dependencies)
- Version controlled configs in single repo
- Easier maintenance and development
- Complete installer replication in one place

configs/hypr/scripts/launch_first_available.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Launch the first available application from a list
+for cmd in "$@"; do
+    eval "command -v ${cmd%% *}" >/dev/null 2>&1 || continue
+    eval "$cmd" &
+    exit
+done
+exit 1

configs/hypr/scripts/workspace_action.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+# Workspace action script for dots-hyprland
+hyprctl dispatch "$1" $(((($(hyprctl activeworkspace -j | jq -r .id) - 1)  / 10) * 10 + $2))