fixing important links

[rajithkrishnegowda]

This PR fixes important links issues
#1119

[rajithkrishnegowda]

@teoparvanov @MasterSkepticista
I’ve reviewed the repository and found a couple of links that may need attention and correction:

1. In governance.md:
   a. Voting (Quorum check): The link to the quorum section should be validated. Please ensure that the link points to the correct section of the GOVERNANCE.md file. Specifically, check if the #quorum anchor is still valid, and if the section has been renamed or moved, the link will need to be updated.

b. Public Maintainers Meetings Calendar: The link to the public maintainers meetings calendar may need verification. Please check if the calendar is still hosted at this URL. If the link is broken or the calendar has been moved, kindly provide an updated link, or reach out to the maintainers for clarification.

2. In README.md:
   The "Open in Colab" link is not currently working. Please verify if the link to the Colab notebook is correct and functional. If the notebook has been moved or deleted, the link needs to be updated. Alternatively, if the notebook is missing, you may need to upload it to the correct directory or provide a new valid link for users to access the Colab environment.

Let me know if you need any further details or assistance in fixing these links.

Thanks!