Remove jobs_url from SiteConfig and Related Code ✂️

[mstruve]

Currently, we have code in place that will show a banner with a link to our jobs page if a user searches for "job" or "jobs". This is extremely DEV specific and we have decided that it will not be included in the Forem starter pack so we want to remove it.

Screenshot of the feature in action.

To do this we need to:

• remove the jobs_url from SiteConfig
• remove related code that uses the jobs_url
• remove code that triggers the banner to show when job or jobs is searched
• remove anything else related that I forgot ;)
• communicate change via forem.dev and the admin changelog

Related Stage 0 with Product Sign off: https://github.com/forem/rfcs/issues/201

[github-actions]

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