message: Update CLI readme to install latest alpha
  As pointed out the current beta in npm is quite old (0.4.0) so minor change to the documentation to point to the alpha version.
diff: @@ -26,10 +26,10 @@ Having Node.js and npm available, install the latest release of the [`nextclade`
  npm install --global @neherlab/nextclade
  ```
  -you may also try the cutting-edge beta version:
  +you may also try the cutting-edge alpha version:
  ```bash
  -npm install --global @neherlab/nextclade@beta
  +npm install --global @neherlab/nextclade@alpha
  ```
  Explore available options:
  