Merge branch 'update-quickstarts' into 'master'

content/_index.md

content/quickstarts/basic_linux_commands.md

content/quickstarts/for_maclinux_users.md

content/quickstarts/fortran_c_on_hcc.md

content/quickstarts/fortranc_on_hcc.md

content/quickstarts/how_to_change_your_password.md

content/quickstarts/how_to_setup_x11_forwarding.md

...nt/quickstarts/reusing_ssh_connections_in_linux_or_mac.md

content/quickstarts/using_nus_gitlab_instance/_index.md

..._nus_gitlab_instance/setting_up_gitlab_on_hcc_clusters.md

content/quickstarts/using_unl_gitlab_instance.md

static/attachments/serial_dir.zip

static/images/11304982.png

static/images/11304983.png

static/images/11304984.png

static/images/11637368.jpg

static/images/11637369.jpg

static/images/11637370.png

static/images/11637371.jpg

static/images/11637372.png