Make new_proposal script slightly easier to use (#456)

Reviewed-on: https://codeberg.org/fediverse/fep/pulls/456
Reviewed-by: silverpill <silverpill@noreply.codeberg.org>
Co-authored-by: Helge <helge.krueger@gmail.com>
Co-committed-by: Helge <helge.krueger@gmail.com>

scripts/frontmatter.md

@@ -38,7 +38,7 @@ b3f0
 Alternatively to steps 3. to 6., you can run
 
 ```bash
-python scripts/new_proposal.py TITLE OF YOUR PROPOSAL
+./scripts/new_proposal.py TITLE OF YOUR PROPOSAL
 ```
 
 that should create a prefilled template for you.

scripts/new_proposal.py

@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 from argparse import ArgumentParser
 import os
 import shutil