Remove unused sponsors.md

Author: kzu

.netconfig

@@ -106,11 +106,6 @@
 	sha = 85829f2510f335f4a411867f3dbaaa116c3ab3de
 	etag = 086f6b6316cc6ea7089c0dcc6980be519e6ed6e6201e65042ef41b82634ec0ee
 	weak
-[file "docs/sponsors.md"]
-	url = https://github.com/devlooped/sponsors/blob/main/sponsors.md
-	sha = 6fb43bffd12bea00ab2182498fc249dab0e56413
-	etag = dcbcf9e8b108ab3543d48c20622299d24bd2c9c16de99169c7e6a989ef284226
-	weak
 [file ".github/release.yml"]
 	url = https://github.com/devlooped/oss/blob/main/.github/release.yml
 	sha = 0c23e24704625cf75b2cb1fdc566cef7e20af313