Decommission content blocking tour pages

[alexgibson]

Description

As per: https://bugzilla.mozilla.org/show_bug.cgi?id=1564367, the content-blocking UITour is being removed as of Firefox 70. This means that sometime after 2019-10-22, we can decommission and remove the tour from mozorg at:

• /firefox/content-blocking/start/
• /firefox/tracking-protection/start/

The proposed URL to redirect these pages to is: https://support.mozilla.org/kb/content-blocking

---

💛 Success Criteria 💛

• Pages are removed and redirected in production (x) weeks after the launch of FIrefox 70.

Tasks

• Remove templates.
• Redirect URLs to SUMO.
• Update UITour documentation.

[Patil2099]

@alexgibson Should I make a Pr for this issue?

[alexgibson]

@Patil2099 this can't be decommissioned until after Firefox 70 is released. I'd suggest waiting until then, thanks.

[Patil2099]

@alexgibson Firefox 70 has been released. Can I work on this issue now?

[alexgibson]

@Patil2099 the Firefox 70 update only just launched, so I think we should probably wait a few weeks for people to update.

[alexgibson]

@Patil2099 if you're still interesting in working on this issue, I think we've now given enough time that we can safely remove and redirect the pages.

[Patil2099]

@alexgibson I will start working on it.

[alexgibson]

@Patil2099 please let me know if you're actively working on this, else I'd like to pick it up and get it done soon. Thanks again

[Patil2099]

@alexgibson I will make a PR within 12 hours.