Remove out of date resources and tools

[owenatgov]

Change

Removes a number of items from the Resources and tools page that don't follow our contribution criteria for resources and tools.. All of these removals are because the resource is out of date, aligning with our specific criterion:

it’s no more than 3 months behind the latest version of GOV.UK Frontend

The specific removals are:

• GOV.UK Balsamiq wireframes
• GOV.UK Mural resources
• GOV.UK Sketch Wireframing Kit

Notes

All 3 of these resources are from the 'Create prototypes and wireframes' section, leaving that section now comparitively bare. Interested in takes from designers on if this is an unreasonable change.

I wasn't sure about the flow diagram resources. All of them are out of date so this would mean removing that section. However it's unclear if this is ok since flow diagrams are more concerned with pages types than components.

A few resources are borderline in terms of our criteria:

• govuk-frontend-aspnetcore doesn't clearly note that it's a community resource and not a part of govuk-frontend, however it's arguably deducable and is less eggregious that being out of date
• GOV.UK Design System snippets for Nova appears to be out of date against the 3 month criterion
• GOV.UK Design System snippets for Visual Studio Code doesn't state what version of govuk-frontend it's operating against

This PR has prompted some discussion in the team about our R&T criteria, notably that 3 months might be too harsh. Some initial thoughts are to make it more lenient by changing it to the most recent major version rather than the latest release. An idea in the same vein is to have an 'archive' section or page that allows us to keep resources that have become out of date but might still be useful for people. These aren't things for this PR but are worthwhile to think about.

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[domoscargin]

The first 3 wireframing resources are all pretty obviously unmaintained, but the Nova and especially VS Code snippets are being actively maintained, so I'd say we should reach out to the creators to let them know what we're thinking and see if they want to remain on the list.

I personally think the 3 month rule is too harsh - I'd probably argue for making that either "compatible with the latest major version of govuk-frontend" on the benevolent end, or "within the last [x] feature versions" on the stricter end.

[owenatgov]

@domoscargin Me and some of the other devs had a chat about this on slack speaking to your point.

What I'm gonna do is:

• Reduce the scope of this PR to only remove those 3 wireframing tools
• Make issue to cover
  • reviewing the R&T contribution criteria
  • thinking about how we assess R&Ts