Add SA postmortems

[tobiasvl]

Find a way to host and link to these postmortems:

• https://forums.somethingawful.com/showthread.php?threadid=3634812&userid=0&perpage=40&pagenumber=5#post452387007
• https://forums.somethingawful.com/showthread.php?threadid=3634812&userid=0&perpage=40&pagenumber=5#post452433708
• https://forums.somethingawful.com/showthread.php?threadid=3634812&userid=0&perpage=40&pagenumber=2#post433593035