docs: render supported enterprise versions from json

[dgarcia360]

Closes #27

Renders the enterprise table from the JSON file: docs/_static/data/enterprise_supported_versions.json

The JSON file will be available at https://docs.scylladb.com/stable/_static/data/enterprise_supported_versions.json once published.

How to test

1. Clone this PR and build the docs.
2. Open http://127.0.0.1:5500/versioning/version-support-enterprise/. The table should render as follows:

[annastuchlik]

@dgarcia360 This all looks good. I just want to make sure I understand how to add future updates. When there's a new version, I need to:

1. Add it to the JSON file docs/_static/data/enterprise_supported_versions.json.
2. Provide all the details and set show_version_policy_link to true or false.

In this way, we will see the update both in the JSON file and on the/versioning/version-support-enterprise/page.

Please confirm before I merge it.

[annastuchlik]

@tzach Please have a look. I'm OK with that solution - it's the simplest one, and we have full control over the content.

[dgarcia360]

@annastuchlik Exactly

[tzach]

LGTM