Fix Previous Releases list in template.  Console::Virtual release.
Better pluralization.
Update some descriptions of implemented games.
Merge.
Create templates for remaining online installations.
Support for bespoke templates for types.

--HG--
rename : templates/type.html => templates/type_Book.html
Gallery -> Online Installations.

--HG--
rename : templates/type_Book.html => templates/type_Online Installation.html
My opinion of HTML5.
Pluralize file name, for consistency.

--HG--
rename : data/language-construct.yaml => data/language-constructs.yaml
Update my thoughts on closures.
Render sample-input, -output, and -credit.
Make Gemooy page less terrible.
Fix "Try it Online" links.
Some (not all) improvements for programming language families.
Programming Language Family is "implementable"; update doc index.