refactor: update igniteui-doc-mcp package structure and dependencies

- Renamed package to @igniteui/mcp-server for clarity.
- Updated README.md to reflect new package name and installation instructions.
- Modified package.json to include exports and files for better module resolution.
- Added missing dependencies in package.json.
- Updated index.ts to include shebang for direct execution.
- Enabled TypeScript declaration file generation in tsconfig.json.

Author: dkalinovInfra

packages/igniteui-mcp/igniteui-doc-mcp/.npmignore

@@ -0,0 +1,28 @@
+# Source and config
+src/
+tsconfig.json
+.env
+.env.*
+.gitattributes
+CLAUDE.md
+test.json
+
+# Pipeline scripts
+scripts/
+
+# Documentation submodules and processing artifacts
+angular/
+blazor/
+react/
+webcomponents/
+common/
+docs_baseline/
+dist/docs_processing/
+dist/docs_prepeared/
+dist/docs_final/
+dist/diff-manifest.json
+tmp/
+
+# Dev files
+node_modules/
+*.tgz