backports-feedstock normalization

[ryanskeith]

Removing backports-feedstock from root dir and adding it back in as a submodule.

[varlackc]

Here is a list of old PRs that have to be closed in aggregate

#24

#50

#86

#87

#99

#100

#101

#102

#172

#196

#202

#221

#227

[ryanskeith]

We decided not to do this individually.