Adding Why Vue.js video to Introduction page#1377

Merged

chrisvfritz merged 2 commits intovuejs:masterfrom Gregg:master

Jan 10, 2018

+5

Commits on Jan 8, 2018

Added video into guide introduction
Gregg
committed

Commits on Jan 9, 2018

Added modal styles to page, put video line on one file, and reset iframe margin
Gregg
committed