<p>To answer your points:</p>
<ul>
<li>We haven't documented yarn yet because we don't have a good solution for Ubuntu but what you did is probably the least worst approach for now.</li>
<li>I don't think you needed that bundle stuff at all and I wouldn't advise it - the real error there was the settings thing I think. It's a bad idea to overwrite the apt installed bundler with a gem installed one like that anyway - we should either use one of the other.</li>
<li>As I said, the settings thing is known about - there's a ticket somewhere I think though I couldn't find it - it's not clear what is best to do but copying is certainly not required or advisable as it will stop you getting any updates to defaults. An empty file is better.</li>
<li>Yes the image optimiser things are warnings but there is no way to get rid of them.</li>
</ul>

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