Link Checker Report about awesome-sre HOT 1 CLOSED

As #150 doesn't address all of them, I'm adding here items for further discussion, along with my thoughts.

Fix
✗ [404] https://twitter.com/The_SRE_Dev | Network error: Not Found
profile is gone, but it was just getting SRE info from dev.to. I'd change the category and point to the dev.to url https://dev.to/t/sre

Delete
✗ [404] https://blog.box.com/blog/a-tale-of-postmortems/ | Network error: Not Found
Even though is cached on Google, Box got rid of all the posts before January 12th 2016.

✗ [404] https://www.cruform.com/sre-capability-map/ | Network error: Not Found
Cruform is now sre path and it asks for your email. The link on the footer (https://www.srepath.com/?page_id=687) doesn't do much.

✗ [404] https://www.youtube.com/watch?v=bwt6TZjefGM | Network error: Not Found
Google made it private. As I wasn't able to found the video anywhere,

from awesome-sre.