Switch the guide to use the fetch() API and various small changes

[tjvantoll]

Ping @ikoevska

I'm trying to make the guide match up exactly with the master branch, so it's an accurate reference for users going through the tutorial.

The big change that was in master was using fetch instead of the http module, so I implemented that in the guide, and there were a few naming discrepancies.

There are a few other trivial things I noticed while going through the guide in its entirety again. Let me know what you think.

[tjvantoll]

The other thing I need to add is a small section on ActivityIndicator. I didn't quite finish that section so it's not in this PR yet. I'll get to it tomorrow morning.

[tjvantoll]

Alright the section on ActivityIndicators is in there now. This is ready for a review.

[tjvantoll]

Ping @ikoevska. I think all the 1.3 changes are in here now. I'll do one more run through to verify that, but this content is ready to be looked at.

[ikoevska]

I believe tns run android --emulator --geny <Name> works. However, people need to check their Geny devices and so on. So your option is a good start.

[tjvantoll]

Thanks @ikoevska. I believe I addressed all the comments.

[ikoevska]

There is a general rule in the docs world to avoid lists containing one item. You can leave this as it is (that's why I didn't comment the first time) but I suggest trying locally how making this a top-level list item and renaming it to node_modules/tns-core-modules works out. If you like how it looks, you can apply the change here as well.

[ikoevska]

Looking good, check my comment about the tns modules folder description and see if you might want to apply it. Whichever you choose, you have a 👍 for merging this.

[tjvantoll]

I took your suggestion of keeping the list of folder/files all top level. Thanks again for the review. I'll merge this in.

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