docs: add documentation for rocket dyn_template example

[jhawkesworth]

Documentation for shuttle docs site for the example that was recently merged under shuttle-hq/shuttle-examples#38

[jhawkesworth]

@oddgrd documentation as requested.

[joshua-mo-143]

@oddgrd Apologies for the re-ping but it looks like this has been open for quite a while with no update - should we be merging this in accordance with the previously merged PR for shuttle-examples?

[oddgrd]

Oh, sorry @jhawkesworth! I saw this way back but then forgot to get back to it. I'm not sure we can merge this now since the docs for rocket have been mostly pulled out. I believe this is up for discussion though, so we could consider including this if we bring rocket docs back to the front.

[jhawkesworth]

As things stand the core team have more important things to get done so let's close this. Sometimes PRs just arrive at the wrong moment.