Update Hugo repo & version; add missing Zola alias

[mbrukman]

• replace spf13/hugo with goghugoio/hugo since the repo has moved
• update Hugo version from 0.19 to 0.94.2
• add link to cache/cache.go which lists all current aliases
• add missing alias for zola
• spelling: "for" → "format"

[janbrasna]

Well… actually Zola is the new repo for Gutenberg (and keats/gutenberg redirects to getzola/zola …) — so the question is whether the older aliases shoud be even kept?

[mbrukman]

Thanks for taking a look! You make a good point; I think it makes sense to keep guttenberg alias in cache/cache.go (to avoid breaking old configs which were created when the project was called guttenberg and haven't been updated since then), but new projects should use zola instead, so we can remove it from the README.

Maybe it makes sense to also add a comment to cache/cache.go to specify the lineage and mark one of them as deprecated so folks don't use it?

[janbrasna]

But given GH keeps the redirects it should still work, specifying old gutenberg version should fetch the correct tarball from zola repo eventually without breaking (GH actually keeps the old release artifact filenames intact when moving repos)… well, in theory, as back in the day the tgz/bin naming convention was different from the template used currently — so yea I guess nowadays it really doesn't do anything but get the binary from local cache, not sure if it still works for downloading arbitrary archaic releases remotely…

[janbrasna]

(I actually ended up here trying to sync the versions/aliases with a proposed update to build_images installed software list to streamline the GUTENBERG_/ZOLA_ info to probably make more prominent that <=0.4 was gutenberg and >=0.5 is zola to make it more obvious…)

[janbrasna]

@mbrukman Actually it's well described in:

binrc/templates/templates.toml

Lines 10 to 16 in c3a403d

	gutenberg = [
	{ range = ">0.0.5, <0.4.3", tarball = "%s-v%s-x86_64-unknown-linux-gnu.tar.gz", bin = "gutenberg" }
	]
	zola = [
	{ range = ">=0.5.0", tarball = "%s-v%s-x86_64-unknown-linux-gnu.tar.gz", bin = "zola" }
	]

incl. the correct templates so things are probably still working even now, five years later;)

[janbrasna]

So maybe just a hint along the way:

Suggested change

	- gutenberg: keats/gutenberg
	- zola: getzola/zola
	- zola: getzola/zola (formerly gutenberg: keats/gutenberg)

would suffice?

Otherwise the rest of the PR is all golden, it's about time to update the outdated refs, good job!

[janbrasna]

Well… this version is already a year old. Would make sense to make it more current before merging.

Related: (question is… whether there should not be a "latest" option?)

• add support for using HUGO_VERSION of latest #39