Split up 'exhibits' data.  Decimate online_installations.

--HG--
rename : data/installation/exhibits.yaml => data/installation/games.yaml
rename : data/installation/exhibits.yaml => data/installation/gewgaws.yaml
rename : data/installation/exhibits.yaml => data/installation/languages.yaml
Simple enough to be put in a template.  Probably.
Add fqkeys() iterator to NameSpace.
Pictures have online-buttons now.  You can "try" them, ha.

--HG--
rename : templates/Text.html => templates/Picture.html
It'll be like this, but 2 columns; maybe custom sort function?
Templates will proliferate, but they will be one-liners.
And there they go, proliferating.

--HG--
rename : templates/type_Game.html => templates/type_Automaton.html
rename : templates/type_Game.html => templates/type_Conlang.html
rename : templates/type_Game.html => templates/type_Gewgaw.html
rename : templates/type_Game.html => templates/type_Library.html
rename : templates/type_Game.html => templates/type_Musical Composition.html
rename : templates/type_Game.html => templates/type_Picture.html
rename : templates/type_Game.html => templates/type_Platform.html
rename : templates/type_Game.html => templates/type_Programming Language Family.html
rename : templates/type_Game.html => templates/type_Text.html
rename : templates/type_Game.html => templates/type_Tool.html
Small fixups, mostly auspices.