Remove :applications instructions from getting started guide

[axelson]

It was previously removed from the README but hasn't yet been removed from the Getting Started Guide.

Summary of changes

Removes outdated instructions from the getting started guide to better match the README: 77984a5

Checklist

• New functions have typespecs, changed functions were updated
• Same for documentation, including moduledocs
• Tests were added or updated to cover changes
• Commits were squashed into a single coherent commit
• Notes added to CHANGELOG file which describe changes at a high-level
  • N/A

[coveralls]

Coverage decreased (-0.04%) to 72.08% when pulling a3ea00c on axelson:remove-applications-instructions into 45424fa on bitwalker:master.

[bitwalker]

Thanks!