Add .gitignore and remove checked-in nebula modules

Add a .gitignore and remove numerous @nebulaproject packages and their asset files from node_modules to stop committing dependency artifacts (glyphs, binaries, src/dist files). Also update packages/core/package.json metadata and refresh lockfiles.

node_modules/.package-lock.json

@@ -34,7 +34,10 @@
     "packages/core": {
       "name": "@nebulaproject/core",
       "version": "0.1.3",
-      "license": "MIT"
+      "license": "MIT",
+      "dependencies": {
+        "@nebulaproject/core": "^0.1.3"
+      }
     },
     "packages/core-glyphs": {
       "name": "@nebulaproject/core-glyphs",

node_modules/@nebulaproject/core-glyphs/README.md

@@ -1,21 +0,0 @@
-# @nebula/core-glyphs
-
-Controller glyph mappings and lookup helpers. Data-only, no rendering logic.
-
-## Why it exists
-Controller prompts should be consistent across Steam Deck, Xbox, and PlayStation. This package keeps glyph mapping in one place.
-
-## Usage
-
-```js
-import { getGlyph, getGlyphAssetPath } from "@nebula/core-glyphs";
-
-const glyph = getGlyph("steam-deck", "confirm");
-console.log(glyph); // "A"
-
-const asset = getGlyphAssetPath("steam-deck", "confirm");
-console.log(asset); // "assets/Steam Deck/SteamDeck_A.png"
-```
-
-## SteamOS / Steam Deck notes
-Provide Deck-specific prompts by selecting `steam-deck` when the device is detected. Use the asset path helper or bind your own icon assets keyed by the glyph labels.