Fixes #627: sort how-tos chronologically

[patyiscoding]

closes #627

[cypress]

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Test summary

21 • 3 • 12 • 0

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Run details

Project	onearmy-community-platform
Status	Failed
Commit	7e26a60
Started	Oct 19, 2019 2:26 PM
Ended	Oct 19, 2019 2:33 PM
Duration	06:34 💡
OS	Linux Ubuntu Linux - 14.04
Browser	Electron 61

View run in Cypress Dashboard ➡️

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Failures

	academy.spec.ts ⏯		1
1	[Academy] > [List instructions] > [By Everyone]
	howto/read.spec.ts ⏯		2
1	[How To] > [List how-tos] > [By Everyone]
2	[How To] > [Filter with Tag] > [By Everyone]

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[chrismclarke]

I'm still not sure whether it would be best to sort by created or modified - I'm not sure if every change made should bump it back up to the top of the list, but will leave that for UX team to decide and merge for now as it's definitely and improvement.