Emacsg: Document help and helpall targets here

Hide bootstrap-borg, when that is done; and the codespell targets
before then.

Makefile

@@ -1,17 +1,28 @@
 -include lib/borg/borg.mk
 
+ifndef BORG_DIR
+
+help helpall::
+	$(info )
+	$(info Bootstrapping)
+	$(info -------------)
+	$(info make bootstrap-borg  = make borg and make targets available)
+	@printf "\n"
+
 bootstrap-borg:
 	@git submodule--helper clone --name borg --path lib/borg \
 	--url git@github.com:emacscollective/borg.git
 	@cd lib/borg; git symbolic-ref HEAD refs/heads/master
 	@cd lib/borg; git reset --hard HEAD
 
+else
+
 helpall::
 	$(info Test and fix targets)
 	$(info --------------------)
 	$(info make codespell-dry   = run codespell, dry run)
 	$(info make codespell-fix   = run codespell, write fixes)
-	$(info )
+	@printf "\n"
 
 codespell-dry:
 	@cd lib; codespell \
@@ -26,3 +37,5 @@ codespell-fix:
 	  --exclude-file ~/.emacs.d/etc/codespell/ignore-lines \
 	  --skip $(shell sed '/^\s*$$/d;/^\s*#.*$$/d;s/#.*//;s/\s//g' \
 	  ~/.emacs.d/etc/codespell/ignore-files | tr "\\n" ",")
+
+endif