* d/rules: Exclude sources from installation.

  * d/rules: Use gem installation layout.

  * d/control (Build-Depends): Add libxslt1-dev for nokogiri.h.
  * d/patches/Look-for-nokogiri-header-in-vendorhdrdir.patch: Add patch.
    - Look for nokogiri.h in the vendor header directory (closes: #993828).
  * d/patches/series: Enable new patches.

  * d/patches/Fix-Ruby3-keywords-issue.patch: Add patch.
    - Fixes deprecated keyword parameters handling (closes: #1000488).
  * d/patches/series: Enable new patch.

Changes-By: lintian-brush
Fixes: lintian: out-of-date-standards-version
See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html

Changes-By: lintian-brush
Fixes: lintian: upstream-metadata-missing-repository
See-also: https://lintian.debian.org/tags/upstream-metadata-missing-repository.html

Changes-By: lintian-brush
Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

Update to upstream version '2.0.2'
with Debian dir 9c13354e865175ccf545f597d411cbb4bd0c60b3

Update to upstream version '2.0.2+ds'
with Debian dir 25297de4beefcb62a33d78e91d58a9d22dcaee59

Fixes: lintian: vcs-field-not-canonical
See-also: https://lintian.debian.org/tags/vcs-field-not-canonical.html

Fixes: lintian: vcs-obsolete-in-debian-infrastructure
See-also: https://lintian.debian.org/tags/vcs-obsolete-in-debian-infrastructure.html

Fixes: lintian: upstream-metadata-file-is-missing
See-also: https://lintian.debian.org/tags/upstream-metadata-file-is-missing.html

Fixes: lintian: uses-debhelper-compat-file
See-also: https://lintian.debian.org/tags/uses-debhelper-compat-file.html

Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

Fixes: lintian: debian-watch-uses-insecure-uri
See-also: https://lintian.debian.org/tags/debian-watch-uses-insecure-uri.html

Fixes: lintian: insecure-copyright-format-uri
See-also: https://lintian.debian.org/tags/insecure-copyright-format-uri.html