Remove "make spell"

Author: gavv

.spelling

@@ -1,4 +1,4 @@
-all: tidy gen build lint test spell
+all: tidy gen build lint test
 
 tidy:
 	go mod tidy -v
@@ -38,11 +38,5 @@ else
 	go test -short ./...
 endif
 
-spell:
-ifneq ($(shell which mdspell),)
-	mdspell -a README.md
-	sort .spelling -o .spelling
-endif
-
 toc:
 	markdown-toc --maxdepth 3 -i HACKING.md