We use 8ch indents right now, which causes everything to be interpreted
as `<pre>` (or whatever your favourite equivalent is). Lets use proper
markdown.
While at it, this fixes a set of minor issues:
* Surround markdown syntax with `` to suppress interpretation (like in
the regexp, etc).
* Replace hyphens before dates with proper em-dash.
* Fix indentation in some news-entries, which did not align correctly.
This will also synchronize the file with osbuild/NEWS.md, which soothes
my heart.
Import a new `NEWS.md` file with the changelog for each release. This is
targetted at distributors, so it should contain information on new
features, modified features, and anything important to packagers. This
is not a replacement for the git-changelog, but rather a human-readable
instruction to packagers what needs to be changed when using the new
release.
Additionally, copy `make release` from *osbuild* to help in creating new
release entries in NEWS.md.
