docs(many): update Contributing links (#29498)

Issue number: N/A

---------

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## What is the current behavior?
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The bug report points to an old location of the Contributing doc.

## What is the new behavior?
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this PR. -->

- Updated the link to point to the new location under the docs folder.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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See
https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md#footer
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## Other information

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screenshots of how the component looks before and after the change. -->

N/A

packages/vue-router/README.md

@@ -24,7 +24,7 @@ npm run build
 
 ## Contributing
 
-See our [Contributing Guide](https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md).
+See our [Contributing Guide](https://github.com/ionic-team/ionic-framework/blob/main/docs/CONTRIBUTING.md).
 
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