DESCRIPTION: add IDS maintainer, drop stale Date, fix URLs

- Authors@R: Marc Kupietz added as [aut, cre] (single maintainer per
  Writing R Extensions/CRAN policy), Christophe Dervieux stays [aut];
  all other attribution unchanged.
- Removed the stale 'Date: 2017-03-13' field (CRAN ignores and
  auto-generates it; upstream dropped it as well).
- URL/BugReports now point to the IDS GitLab fork, with the upstream
  GitHub kept as second URL. Dependencies audited: rmarkdown (Imports)
  plus testthat/withr/xfun/xml2 (Suggests) match actual usage; bslib is
  a harmless leftover.

Change-Id: Ifdec3ce4c200c725ff728b7f4e5d45b08b23b740
diff --git a/DESCRIPTION b/DESCRIPTION
index ac4cfe0..9e6c402 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -2,9 +2,9 @@
 Package: revealjs.ids
 Title: R Markdown Format for 'reveal.js' Presentations -- IDS Mannheim Corporate Design Theme Edition
 Version: 0.9.1.9009
-Date: 2017-03-13
 Authors@R: c(
-    person("Christophe", "Dervieux", , "cderv@posit.co", role = "cre"),
+    person("Marc", "Kupietz", , "kupietz@ids-mannheim.de", role = c("aut", "cre")),
+    person("Christophe", "Dervieux", , "cderv@posit.co", role = "aut"),
     person("JJ", "Allaire", , "jj@posit.co", role = c("aut")),
     person("Hakim", "El Hattab", role = c("aut", "cph"),
            comment = "reveal.js, https://github.com/hakimel/reveal.js"),
@@ -17,8 +17,8 @@
 Description: R Markdown format for 'reveal.js' presentations, a framework
     for easily creating beautiful presentations using HTML.
 License: MIT + file LICENSE
-URL: https://github.com/rstudio/revealjs
-BugReports: https://github.com/rstudio/revealjs/issues
+URL: https://gitlab.ids-mannheim.de/ids/revealjs, https://github.com/rstudio/revealjs
+BugReports: https://gitlab.ids-mannheim.de/ids/revealjs/issues
 Depends:
     R (>= 3.0)
 Imports: