fixed links/attachments for 2018 events pages

content/events/2018/june_workshop_series_2018.md

content/events/2018/software_carpentry_workshop_setup.md

content/events/2018/unl_stat_850_fall_2018.md

static/images/PATH_environment.png

static/images/changes.png

static/images/complete_wizard.png

static/images/default_editor.png

static/images/extra_options.png

static/images/https_transport.png

static/images/public_license.png

static/images/select_components.png

static/images/terminal_emulator.png

static/images/text_file_endings.png