Change cats url for index page · cds-astro/a-FAIR-journey-for-astronomical-data@779fc6b

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/upload-artifact@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

[missing anchor]: [General rules](#general_rules)

[missing anchor]: [Nomenclature](#nomenclature)

[missing anchor]: [Astrometry](#astrometry)

[missing anchor]: [Photometry](#photometry)

[missing anchor]: [Time](#time)

[missing anchor]: [Redshift/velocity](#redshift)

[missing anchor]: [Classifications](#classifications)

[missing anchor]: [Orbital parameters](#orbital_parameters)

[missing anchor]: [Tables](#tables)

[missing anchor]: [Figures](#figures)

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