feat(web): implement the --print option

Christian Heusel requested to merge gromit/devtools:repo-web-link into master

I found myself in some situations where I could not use the xdg-open (i.e. when being connected to my arch machine via ssh), therefore this commits implements the option to just print the repo link.

Signed-off-by: Christian Heusel christian@heusel.eu

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