chore(docs): removed Internal repository (#373)

# What ❔

- removed `Internal repository`

## Why ❔

- 404

## Checklist

<!-- Check your PR fulfills the following items. -->
<!-- For draft PRs check the boxes as you complete them. -->

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [x] Tests for the changes have been added / updated.
- [x] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.

---------

Co-authored-by: Roman Brodetski <[email protected]>

docs/repositories.md

@@ -68,8 +68,8 @@
 
 ## zkSync Lite (v1)
 
-| Internal repository                                     | Public repository                                                           | Description                        |
-| ------------------------------------------------------- | --------------------------------------------------------------------------- | ---------------------------------- |
-| [zksync-dev](https://github.com/matter-labs/zksync-dev) | [zksync](https://github.com/matter-labs/zksync)                             | zksync Lite/v1 implementation      |
-|                                                         | [zksync-docs](https://github.com/matter-labs/zksync-docs)                   | Public documentation for zkSync v1 |
-|                                                         | [zksync-dapp-checkout](https://github.com/matter-labs/zksync-dapp-checkout) | ??                                 |
+| Public repository                                                           | Description                        |
+| --------------------------------------------------------------------------- | ---------------------------------- |
+| [zksync](https://github.com/matter-labs/zksync)                             | zksync Lite/v1 implementation      |
+| [zksync-docs](https://github.com/matter-labs/zksync-docs)                   | Public documentation for zkSync v1 |
+| [zksync-dapp-checkout](https://github.com/matter-labs/zksync-dapp-checkout) | ??                                 |