ENH+NF: add javascript customization options via config

[jsheunis]

This PR:

• Addresses: https://github.com/datalad/datalad-catalog/issues/281
• Addresses: https://github.com/datalad/datalad-catalog/issues/282

Both are done by allowing more configuration options via the config file, basically resulting in show/hide logic for certain UI components.

In order to apply these changes to an existing catalog, the affected html and javascript files will have to be checked out into the existing catalog repo, and the catalog's config file will need to be updated with the "social_links" and "dataset_options" fields.

Towards parts of https://github.com/psychoinformatics-de/sfb1451-projects-catalog/issues/5

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (377fffe) 82.67% compared to head (b009163) 82.67%.

Additional details and impacted files

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[jsheunis]

Ooh sorry (it's about time to implement https://github.com/datalad/datalad-catalog/issues/273 then)

Here are some examples:

1

config: {
    ...
    "social_links": {
        "about": null,
        "documentation": null,
        "github": null,
        "twitter": null
    },
    "dataset_options": {
        "include_metadata_export": false
    },
    ...
}

2

config: {
    ...
    "social_links": {
        "about": null,
        "documentation": "https://docs.datalad.org/projects/catalog/en/latest/",
        "github": "https://github.com/datalad/datalad-catalog",
        "twitter": "https://twitter.com/datalad"
    },
    "dataset_options": {
        "include_metadata_export": true
    },
    ...
}

[jsheunis]

Ok, fire in the hole.