Add hooks: base.modals and dataset.resource.card.extra-buttons

[AntoineAugusti]

This PR adds a schema modal to resources that have specified a schema.

Content of the PR

• the addition of 2 hooks on udata
• the release of a new plugin, udata-schema-gouvfr

Please review also the PR for the plugin.

Regarding hooks, I tried to stick to the naming convention in place

udata/udata/templates/dataset/display.html

Line 196 in a9b15a0

{{ hook('dataset.display.after-description') }}

I noticed the hooks mechanism is documented, but there is no documentation regarding where they are in templates or how to find them (do a search for {{ hook( in templates). I could add a note in the documentation if you'd like.

Before merging

• Transfer udata-schema to etalab
• Rename udata-schema to udata-schema-gouvfr
• Revert etalab/udata-schema-gouvfr@83bbe9b (may need to bust cache on CircleCI)
• Tag 0.1.0 for udata-schema-gouvfr

[abulte]

👏

• Add a CHANGELOG entry
• re hooks discoverability, I wonder if it would be useful (and not too painful to maintain) to have list of the available hooks in the docs

[AntoineAugusti]

✅ for the CHANGELOG entry

For the documentation, I thought about adding a note like.

If you want to know which hooks are already available, search for {{ hook( in templates