The first level is never numbered. To change this, find the spot in the source where it is mentioned (this is because 'it looks stupid') and change the source.

= # level 1 (no number) =
== # level 2 (number) ==
=== # level 3 (number) ===
== # level 2 (number) ==
= # level 1 (no number) =

level 1 (no number)

1. level 2 (number)

1.1. level 3 (number)

2. level 2 (number)

level 1 (no number)

3. level 2 (why doesn't it start at 1?)