jiralert: Improved docs and config.

[bwplotka]

Changes:

• Template file is not needed anymore if you don't define anything. (https://github.com/free/jiralert/issues/11)
• Clean up of not used structs & vars
• Improved comments on doc which makes example not needed (if we can use goDocs)

Thoughts @free ? (:

Signed-off-by: Bartek Plotka [email protected]

[bwplotka]

Let me get back to this, rebase and improve 🤗