fix: fix redirections links (#13465)

Makefile

@@ -191,6 +191,8 @@ godocs:
 # This builds a docs site for each branch/tag in `./docs/versions`
 # and copies each site to a version prefixed path. The last entry inside
 # the `versions` file will be the default root index.html (and it should be main).
+# Only redirects that are built into the "redirects" folder of each of
+# the branches will be copied out to the root of the build at the end.
 build-docs:
 	@cd docs && \
 	while read -r branch path_prefix; do \
@@ -200,6 +202,7 @@ build-docs:
 		cp -r .vuepress/dist/* ~/output/$${path_prefix}/ ; \
 		cp ~/output/$${path_prefix}/index.html ~/output ; \
 		cp ~/output/$${path_prefix}/404.html ~/output ; \
+		cp -r ~/output/$${path_prefix}/redirects/* ~/output || true ; \
 	done < versions ;
 	@echo $(DOCS_DOMAIN) > ~/output/CNAME