Add section(s) about services & associated packages

[maelle]

Ex-METACRAN services maybe as their own section, called something like R/CRAN data or metadata.

• cranatgh

• cranlogs

• rversions

• pkgsearch (with crandb)

• special focus on ✨ badges ✨ (a special section?)

[maelle]

Conversely, make sure the pkgdown websites of all these packages link to the docs of R-hub with a sentence like "this package is a service of R-hub, that blablabla provides other services to package developers".

[maelle]

Conversely, make sure the pkgdown websites of all these packages link to the docs of R-hub with a sentence like "this package is a service of R-hub, that blablabla provides other services to package developers".

That's something that should be done via the header and footer of the pkgdown template, like what happens in rotemplate/the tidyverse pkgdown template.