[bitnami/*] Add docs submodule (#5093)

* [bitnami/*] Add docs submodule

* Update .gitmodules

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "docs"]
+      path = docs
+      url = https://github.com/bitnami/charts-docs
+      branch = main

docs

@@ -0,0 +1 @@
+Subproject commit d02d04b816b628e9690ed8bb7422029e3419a98e