Homepage: suppress the file-tree sidebar on the landing

[rufuspollock]

The landing page still shows Flowershow's left file-tree nav, which lists internal folders (Skills, Talk, Library, Ltp, Docs, Alignment). It is separate from the top nav (Introduction · Demos · Guide · Blog · About) and adds noise to what is meant to be a clean landing.

Find the Flowershow config/theme option to hide the file sidebar on the homepage (or globally, if the top nav is now sufficient).

[dvdgdn]

Placed in the Reason Commons model for this repository as t-e-19-action, a transition action in reason-commons.ltp.yaml (PR #39). Why it sits there, what the model says it should change, and what it does not claim: report — Issue #19.

The model is a candidate until it is ratified in the Reason Commons commons for this project; nothing about this issue changes. When that commons is connected to this repository the app projects accepted actions as managed issues of its own (title = the action's statement, labelled rc:*) and cannot yet adopt an existing issue as that action — that is #35 — so the connection waits for #35, and until then this comment is how to find the model from here.