Merge branch 'ps/build-meson-html'

The build procedure based on meson learned to generate HTML documention pages. * ps/build-meson-html: Documentation: wire up sanity checks for Meson t/Makefile: make "check-meson" work with Dash meson: install static files for HTML documentation meson: generate articles Documentation: refactor "howto-index.sh" for out-of-tree builds Documentation: refactor "api-index.sh" for out-of-tree builds meson: generate user manual Documentation: inline user-manual.conf meson: generate HTML pages for all man page categories meson: fix generation of merge tools meson: properly wire up dependencies for our docs meson: wire up support for AsciiDoctor