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Part-of: <gstreamer/gst-docs!94>

Adding everything to a `GStreamer-doc-%(project_version)` folder.
Printing release output directory

Fixes gstreamer/gst-docs#35

Part-of: <gstreamer/gst-docs!92>

Fixes: gstreamer/gst-build#60
Part-of: <gstreamer/gst-docs!84>

Mathieu Duponchelle authored Nov 04, 2019 and Mathieu Duponchelle committed Nov 04, 2019

Thanks to that, gtk-doc links (taken from devhelp), are resolved
correctly when gst-docs is built on its own.

Required for our examples

Adding a nice landing page.

And update emoticons.

Using meson subprojects