Remove format in make.jl-generator

[goerz]

Does the format still make sense, here?

DocumenterTools.jl/src/Generator.jl

Lines 30 to 37 in 5306737

	function make(pkgname; format = :html)
	fmtpkg = format === :markdown ? ", DocumenterMarkdown" :
	format === :pdf ? ", DocumenterLaTeX" : ""
	fmtstr = format === :html ? "Documenter.HTML()" :
	format === :markdown ? "Markdown()" :
	format === :pdf ? "LaTeX()" : ""
	sitename = format !== :markdown ? "\n sitename = \"$(pkgname)\"," : ""

As far as I know, DocumenterMarkdown didn't really make the transition to Documenter 1.0, so should we just remove it here (as well as anything else related to mkdocs)

Even if we wanted to keep mkdocs support: I'm not sure the way format is used here is very useful. E.g., with format=:pdf, it would generate (overwrite!) a make.jl file to only have a LaTeX() configuration. My intuition would be that Documenter pretty much always has an HTML() configuration, and then maybe a LaTeX() configuration in addition. I'd expect anything beyond HTML() a pretty special use case that people should set up "by hand", not something that the generator for a default make.jl would take into account.

So, I would recommend just removing the format option, and always generating a make.jl file with an HTML() configuration.

[goerz]

I agree with #90