Document the exact folder for "Keeping the data"

[markiewb]

I migrated my existing non-docker installation, but it does not work out-of-the-box, because of missing information.

I invoked
docker run -d -p 8080:8080 -v /user/john/wiki:/var/lib/tiddlywiki mazzolino/tiddlywiki

My file structure (with existing tiddlers) was /user/john/wiki/tiddlers
But expected was /user/john/wiki/mywiki/tiddlers

Please note the hard-coded mywiki name from init-and-run-wiki

[kiliankoe]

Perhaps the wiki/directory name could be stored as an env var as well, making it customizable.

[djmaze]

@kiliankoe Good idea. I welcome pull requests as currently I am not actively using this myself.