Add .xml sitemap config flag to /system

Is your feature request related to a problem? A clear and concise description of what the problem is.

Client get frustrated that we don't have a simple way to generate an .xml sitemap for Decidim websites. It's recommended for SEO.

Describe the solution you'd like

On a multi-tenant Decidim instance I may not want to generate a sitemap for all orgs as some maybe used for private purposes (ex: "Force users to authenticate before access organization")

As a system admin, I'd like to have a config flag in /system in the org edit form to choose to generate an .xml sitemap for the org I'm editing.

We could use an existing gem like https://www.ruby-toolbox.com/projects/sitemap_generator to generate the site map.

The sitemap generator would need to exclude :

• /admin and /system links
• Private spaces links

The sitemap needs to be be

• frequently updated → a cron job can run periodically
• and sent to search engines → We need to decide if we leave the responsibility to the admin of the org or if we try to ease up the process a little bit for them. We could use this gem https://www.ruby-toolbox.com/projects/pingr so that the pinging to search engine is automated

Describe alternatives you've considered

At this stage I'm wondering :

• if this feature could be of interest to the rest of the community. If not we can always make a module;
• what's the best way to generate a xml sitemap for a Decidim site;

Additional context

Add any other context or screenshots about the feature request here.

Does this issue could impact on users private data?

No

Funded by

Possible funding by Lausanne