Reflect the fact that AWS free tier is not enough

[Guillaume-Garrigos]

The AWS free tier covers only a t2.micro instance, which is unsufficient (nowadays?) for installing TLJH.

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[consideRatio]

I can't say it is or isn't the case, but I think its a claim a bit tricky to make without being specific on the instance part of the free tier.

Looking at https://aws.amazon.com/ec2/instance-types/t2/ I conclude that they provide 1 GB in RAM, and by looking at the following, I conclude its fine to say we can remove this if they only have t2.micro in the free tier.

the-littlest-jupyterhub/.github/integration-test.py

Lines 32 to 35 in 75a5724

	# This is the minimum VM size we support. JupyterLab extensions seem
	# to need at least this much RAM to build. Boo?
	# If we change this, need to change all other references to this number.
	'--memory', '1.5G',

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[yuvipanda]

Thanks a lot, @Guillaume-Garrigos! But maybe now that JupyterLab is no longer a memory hog we can try testing with lower RAM..