The added X-RT-Queue header has nothing to do with this extension

It was mistakenly copied from an internal template.
Remove an unnecessary variable for a simpler template
Touch up the documentation for clarity
Add myself as the pre-extension author
Fix indentation

Looks like copying and pasting in vim without :set paste.
Move Installation after Description but before Usage

It's more useful to read what this extension is about before knowing how
to install it.
Remove bogus files from the MANIFEST and add a MANIFEST.SKIP excluding them
Update build toolchain to the latest
Avoid extra newlines in the template by padding the message appropriately