Revert "Leave migration commented out"

This reverts commit 9c015f3ab324796f155bca6512acc0ff23109c23.
Revert "Revert "India as a low-memory region (bug 1057089)""

This reverts commit 2c936f8fa7be9399339f7395d657bff6cab3082c.
Revert "Revert "Mention low-memory devices on Next Steps (bug 1053235)""

This reverts commit 811925fe89f69521f8da8f5b267d5da3a0ba828f.
Revert "Revert "Request Tarako review on app status page (bug 1040347)""

This reverts commit 66c028eba07ab036fad3eb8f21f89f1352e7f040.

Conflicts:
	mkt/reviewers/views.py
Revert "Revert "Missing request tarako JS""

This reverts commit 1bf16dcde2e2eaf5699af5488c2745e4af9fd854.
Make India migration latest
Add missing import
Merge pull request #2495 from mstriemer/unrevert-tarako-devhub-changes

Unrevert tarako devhub changes
Don't delete the preview before we've processed it (bug 1062359)
Email devs about Tarako reviews (bug 1053355)