Tweak buttondown Skill

[dgalarza]

• adjust automations language
• Add examples of add_tags

[dgalarza]

@copilot investigate the github actions here. It passed but when I inspect it:

Run skills=$(
  skills=$(
    git diff --name-only --diff-filter=d origin/main...HEAD -- 'skills/' \
    | grep -oP '^skills/[^/]+' \
    | sort -u
  )
  echo "skills<<EOF" >> "$GITHUB_OUTPUT"
  echo "$skills" >> "$GITHUB_OUTPUT"
  echo "EOF" >> "$GITHUB_OUTPUT"
  shell: /usr/bin/bash -e {0}
  env:
    pythonLocation: /opt/hostedtoolcache/Python/3.12.13/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.12.13/x64/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.12.13/x64
    Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.12.13/x64
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.12.13/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.12.13/x64/lib
fatal: bad revision 'origin/main...HEAD'

[Copilot]

@dgalarza I've opened a new pull request, #7, to work on those changes. Once the pull request is ready, I'll request review from you.