* docs: add post-mortem

* Update docs/postmortems/2021-08-22-split-postmortem.md

Co-authored-by: Sina Mahmoodi <1591639+s1na@users.noreply.github.com>

* Update docs/postmortems/2021-08-22-split-postmortem.md

Co-authored-by: Sina Mahmoodi <1591639+s1na@users.noreply.github.com>

* Update docs/postmortems/2021-08-22-split-postmortem.md

Co-authored-by: Sina Mahmoodi <1591639+s1na@users.noreply.github.com>

* Update docs/postmortems/2021-08-22-split-postmortem.md

* Update 2021-08-22-split-postmortem.md

* Update docs/postmortems/2021-08-22-split-postmortem.md

Co-authored-by: Sina Mahmoodi <1591639+s1na@users.noreply.github.com>

Co-authored-by: Sina Mahmoodi <1591639+s1na@users.noreply.github.com>