MAINT: Remove unused Makefile

was used for old doc generation

Makefile

@@ -1,35 +0,0 @@
-DOCCRATES = arrayvec nodrop nodrop_union odds
-
-# deps to delete the generated docs
-RMDOCS = 
-
-FEATURES = "odds/unstable"
-
-VERSIONS = $(patsubst %,target/VERS/%,$(DOCCRATES))
-
-docs: mkdocs subst $(RMDOCS)
-
-# https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html
-$(VERSIONS): Cargo.toml
-	mkdir -p $(@D)
-	cargo pkgid $(@F) | sed -e "s/.*#\(\|.*:\)//" > "$@"
-
-$(DOCCRATES): %: target/VERS/%
-	# Put in the crate version into the docs
-	find ./doc/$@ -name "*.html" -exec sed -i -e "s/<title>\(.*\) - Rust/<title>$@ $(shell cat $<) - \1 - Rust/g" {} \;
-
-subst: $(DOCCRATES)
-
-mkdocs: Cargo.toml
-	cargo doc --features=$(FEATURES)
-	cargo doc --features=use_union -p nodrop-union
-	rm -rf ./doc
-	cp -r ./target/doc ./doc
-	-cat ./custom.css >> doc/main.css
-
-$(RMDOCS): mkdocs
-	rm -r ./doc/$@
-	sed -i "/searchIndex\['$@'\]/d" doc/search-index.js
-
-
-.PHONY: docs mkdocs subst $(DOCCRATES) $(RMDOCS)