Mark samples as either "app" or "function"

[evankanderson]

Based on discussion with @mattmoor in #444 , marking configurations based on whether they create an application (have a "main" which creates an http server) or specify only a function (and assume web wrapper injection).

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[mattmoor]

May want to sweep .md too, but thanks for cleaning this up.

[evankanderson]

I ran a grep -Rl "elafros.dev/type" . to find these files. (Which found some of the .tpl ones I'd missed earlier.)

Two other observations, having gone through all these files.

1. Having a src_dir option to git would let us check in the source code alongside the templates, which would be nice.
2. We only have one example of an injected function framework, and most of the rest of our apps are in Go. It would be nice to have some additional diversity in both language and between apps and functions.

[squee1945]

@evankanderson where is the example of the function framework?

[mattmoor]

@squee1945 I bet he's talking about sample/steren-function, which isn't great.