fixed links/attachments from 2017 events pages

content/events/2017/hgrlab_anvil_presentation.md

content/events/2017/june_workshop_series_2017.md

.../2017/software_carpentry_workshop_unl_january_5_6_2017.md

.../2017/software_carpentry_workshop_unl_march_27_28_2017.md

content/events/2017/unk_linear_algebra_feb_28th_2017.md

...nt/events/2017/unl_r_for_biologists_class_march_8_2017.md

content/events/2017/unl_stat802_january_23rd_2017.md

content/events/2017/unl_stat_802_fall_2017.md

content/events/2017/unl_stat_850_fall_2017.md

content/events/2017/unl_stat_950_fall_2017.md

content/events/2017/unl_stat_alpha_seminar_fall_2017.md

content/events/2017/xsede_big_data.md

static/images/cluster_small.png

static/images/crane_login.png

static/images/spark.png

static/images/ssh.png

static/images/tensorflow.png

static/images/terminalSSH.png

static/images/yubikey.png