problem:
some layer packages lists have the open and closing parentheses on the same line
as the first and last listed package, but most seem to have them on a separate
lines.
solution:
put the open and close parentheses on separate lines, except for lists with only
a single package, they are written on the same line as the variable name and
parentheses.
fix the lists indentation
- First remove elixir's layer project prefix, since it was used only for
one binding which would be better suited in tests prefix
- Move `alchemist-project-find-test` to test prefix
- Add `phoenix` prefix and declare bindings
