fix(bundling): use projectRoot for assets (#29978)

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## Current Behavior

When bundling rollup copies wrong readme which ends up in publishing a
root monorepo readme, not a package one

## Expected Behavior

It shoud take the right Readme.md

## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->

Fixes #29975

Author: ThePlenkov

packages/rollup/src/generators/configuration/configuration.spec.ts

@@ -71,7 +71,7 @@ module.exports = withNx(
     tsConfig: './tsconfig.lib.json',
     compiler: 'babel',
     format: ['esm'],
-    assets: [{ input: '.', output: '.', glob: '*.md' }],
+    assets: [{ input: '{projectRoot}', output: '.', glob: '*.md' }],
   },
   {
     // Provide additional rollup configuration here. See: https://rollupjs.org/configuration-options
@@ -100,7 +100,7 @@ module.exports = withNx(
     tsConfig: './tsconfig.custom.json',
     compiler: 'babel',
     format: ['esm'],
-    assets: [{ input: '.', output: '.', glob: '*.md' }],
+    assets: [{ input: '{projectRoot}', output: '.', glob: '*.md' }],
   },
   {
     // Provide additional rollup configuration here. See: https://rollupjs.org/configuration-options

packages/rollup/src/generators/configuration/configuration.ts

@@ -111,7 +111,7 @@ module.exports = withNx(
     format: ${JSON.stringify(options.format ?? ['esm'])},${
       !isTsSolutionSetup
         ? `
-    assets: [{ input: '.', output: '.', glob:'*.md' }],`
+    assets: [{ input: '{projectRoot}', output: '.', glob:'*.md' }],`
         : ''
     }
   },