feat: zksync.io tools menu changed

[linear[bot]]

ZKF-1530 Add link to Ecosystem to the zksync.io menu

### 🗒️ Business Requirements  After releasing `ecosystem.zksync.io` we need to provide visitors of our landing page visit ecosystem website and check our integrations. ### ✅ Acceptance Criterias * [ ] User can see button Ecosystem in the menu * [ ] After click on this button, user will be redirected to `ecosystem.zksync.io` in a new window

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 1988815):

https://zksync-js-docs--pr226-keriat-zkf-1530-add-yhusbfal.web.app

_{(expires Mon, 21 Feb 2022 08:56:55 GMT)}

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[keriat]

:tada: This PR is included in version 2.7.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: