Clean up packages and old references to eslint config (#158)

* Update dependencies and configuration files

- Upgrade Lucide React to version 0.475.0
- Update Markdoc to version 0.5.0
- Bump ESLint to version 9.20.0
- Update Tailwind CSS to version 4.0.5
- Add import-in-the-middle to Sentry package
- Remove import-in-the-middle and require-in-the-middle from web app
- Update browserslist configuration
- Remove eslintConfig from web app package.json
- Add ESLint configuration template for package generator

packages/cms/keystatic/src/custom-components.tsx

@@ -1,5 +1,9 @@
+import type { ComponentType } from 'react';
+
 import type { Schema } from '@markdoc/markdoc';
 
+type Component = ComponentType<unknown>;
+
 /**
  * @name CustomMarkdocComponents
  * @description Custom components for Markdoc. Please define your custom components here.
@@ -12,10 +16,7 @@ import type { Schema } from '@markdoc/markdoc';
  *   Youtube,
  * };
  */
-export const CustomMarkdocComponents: Record<
-  string,
-  React.ComponentType<never>
-> = {
+export const CustomMarkdocComponents: Record<string, Component> = {
   // define your custom components here
 };