New feature: add funder to DESCRIPTION and pkgdown website

[mrustl]

For details see general description of the issue at: KWB-R/kwb.resilience#2

I think at best we should use "fnd" (funder) to link to the projects within the tool was developed (in case this can be clearly said) and also follow-up projects where it is used.

Two use cases for this approach are:
https://kwb-r.github.io/kwb.qmra/authors.html

Or:
https://kwb-r.gitlab.io/qmra.db/authors.html