v0.5.0

Added

• morg --help, morg -h and a bare morg print usage: the
  normalize command, every flag with its argument and a one-line
  description, and a few worked examples. morg --version prints the
  installed version. A bare invocation previously failed on formats it
  could not determine, which told a first-time reader nothing about
  what the CLI accepts; there was no way to ask at all.

  The help text is rendered from the same table the parser dispatches
  on, so it cannot document a flag that does not exist or omit one that
  does.

Changed

• The site names the npm package and links it. The landing page says
  morg is also a CLI and a library, published as @remigius42/morg,
  and shows the npx line that runs it without an install; both pages
  carry an npm link in the nav beside GitHub. Until now the only route
  from the Web UI to the package was the repository, which documents it
  but does not hand it over.

  The nav had fit 320px exactly, so a fourth item would have put the
  whole page into a horizontal scroll: the nav lists now wrap, which
  costs a second row on the narrowest phones and leaves every wider
  viewport as it was.

Fixed

• An unsupported format names the value it rejected, as in
  Unsupported format 'notes.md', rather than only the two it
  accepts, and a value that has a file extension is answered with the
  likely correction: --from and --to take a format name, and the
  file belongs to --input or --output. They sit beside each other
  and read alike, so a file name in the wrong one is an easy mistake that
  the old message left the reader to find unaided. Failures that come
  from the invocation now also point at morg --help.