RFE: Indicate a need for templating elsewhere

[cidrblock]

This PR: #220 required files to be templated to have a j2 suffix, which is step forward but we'll lose native syntax checking and high lighting of the actual file type which is handy.

We could consider moving the .j2 to the second suffix, or add a comment to the file at 0.

[w-edd]

Syntax detection is configurable by one's IDE, though. Should be solvable that way.