Replace https://cd.foundation/jobs/ with GitJobs embed

[caniszczyk]

It would be great to replace what's on https://cd.foundation/jobs/ with a GitJobs embed to test how this will work in the wild.

[tegioz]

Some points to keep in mind about this (comparing the embed to what they have at that url):

• The embed view, at the moment, doesn't display any controls to refine search results or do further searches. It's based on a set of pre-defined filtering criteria (similar to Artifact Hub's or the landscape's embed). It would look like the screenshot below.

• When a job is clicked, it'll be opened in a new tab on gitjobs.dev, to centralize all traffic there and take users where they can explore more job opportunities.

• The embed is based on the same filters available to users to search for jobs. At the moment, we don't have a filter for jobs posted by the members of an organization, as that doesn't seem very interesting from a user's perspective. We do have a filter for jobs listings that offer development time on projects that belong to a given organization (probably limited usefulness for users as well). If that filter is important we could add it though.

[tegioz]

Related to #219 (to synchronize members and projects from the information available on the corresponding landscape).