add link-out icons to sidebar links that leave the page
add link-out icons to sidebar links that leave the page

LaunchCodeEducation/cs50x-stlouis,LaunchCodeEducation/cs50x-kansascity,LaunchCodeEducation/cs50x-kansascity,LaunchCodeEducation/cs50x-stlouis,LaunchCodeEducation/cs50x-kansascity,LaunchCodeEducation/cs50x-stlouis,LaunchCodeEducation/cs50x-stlouis,LaunchCodeEducation/cs50x-maryville,LaunchCodeEducation/cs50x-kansascity,LaunchCodeEducation/cs50x-kansascity,LaunchCodeEducation/cs50x-maryville,LaunchCodeEducation/cs50x-maryville,LaunchCodeEducation/cs50x-stlouis,LaunchCodeEducation/cs50x-maryville,LaunchCodeEducation/cs50x-maryville