add version info to web client footer

[peterstadler]

Only the version of the TEIGarage, more details can be found at the Info endpoint

[sydb]

I am not 100% sure what @peterstadler means by the initial comment, but my first instinct is that I should not have to use the API to get version information, it should be displayed on the page. Perhaps even in a separate box that has a “copy this” button.

Furthermore, or perhaps even more importantly, the version information should be included in the output document. (I realize that a lot of that work belongs to the Stylesheets, not TEIGarage; but TEIGarage is responsible for the first step, putting a proper <appInfo> in the TEI before it is shipped out or converted to something else.)

The version information that should be available includes:

• Stylesheets version
• TEIGarage version
• Edition statement from input TEI (if any)
• p5subset version (if applicable)

[peterstadler]

The initial comment was about constraining this issue, so it's only about adding TEIGarage version info (currently v1.1.1) to the web client footer.
But @sydb's probably right that it makes good sense to include also Stylesheets version and p5subset version to the TEIGarage web client footer.

Injecting version information into the output document is a bit more tricky and deserves a ticket on its own. And I wonder whether this should be a Stylesheets issue rather a TEIGarage issue since (for TEI output formats) the TEIGarage is really only a frontend/interface to the Stylesheets.