Delete GSOC.md
Delete GSOC.md

GSoC 2022 is now complete - we can re-add this file later if needed for next year.
wagtail/wagtail,wagtail/wagtail,zerolab/wagtail,zerolab/wagtail,thenewguy/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,thenewguy/wagtail,wagtail/wagtail,zerolab/wagtail,thenewguy/wagtail,zerolab/wagtail,rsalmaso/wagtail,thenewguy/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,wagtail/wagtail,wagtail/wagtail,thenewguy/wagtail,zerolab/wagtail