all: Unify case of config variable names

[n10v]

All config variables start with low-case and use camelCase.

If there is abbreviation at the beginning of the name, the whole abbreviation will
be written in low-case
If there is abbreviation at the end of the name, the whole abbreviation will
be written in upper-case.
For example, rssURI.

Also, the performance will be better, because viper lowers case of keys with function strings.ToLower, which calls strings.Map(unicode.ToLower, str) and this function works so, what the later there will be upper-case rune, the faster it will work.

Conversation: https://discuss.gohugo.io/t/viper-why-hugo-sets-keys-in-upper-case

[n10v]

Any questions or offers?

[bep]

Any questions or offers?

No. I'm just waiting to merge a potential conflicting PR, that's all.

[n10v]

Ok

[bep]

And I was right. a10b2cd created some conflicts in this PR. Sorry for dumping this in your lap, so to speak, but I just had to get that commit just right without too much distractions.

If you do a rebase master on this branch you will get the same conflicts.

[n10v]

No problem. I will solve it now

[n10v]

Solved

[bep]

Thanks for this, it looks so much better now.

@digitalcraftsman the docs got a cleanup of this, too. I'm not aware of any functional changes since Hugo 0.17 -- maybe we should just rebase the docs branch against master?

[digitalcraftsman]

@digitalcraftsman the docs got a cleanup of this, too. I'm not aware of any functional changes since Hugo 0.17 -- maybe we should just rebase the docs branch against master?

This would be a good idea. I would rather preferring to cherrypick this single commit in order to minimize merge conflicts.

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