Update the Developing offline documentation

[jidrone]

In the process to configure my site to work offline I found some missing steps and values that may help other developers.

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Name	Link
🔨 Latest commit	4740a6fc8127d086b899b4d9624281f56b859a8c

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[reynoldsalec]

Hmm, I can't seem to get the original docs to work or these changes...would be very interested if anyone with experience has comments here.