[DMAAP-BC] Update RTD setup files

Signed-off-by: efiacor <fiachra.corcoran@est.tech>
Change-Id: I0e03f3ed682e319c496b303462732c71436ae6d5
Issue-ID: DMAAP-1824
(cherry picked from commit 86532163d19990e3acfa645a367ed0e0a1c787e0)
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 3797dc8..fa15a7c 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -2,12 +2,8 @@
 # .readthedocs.yml
 # Read the Docs configuration file
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-# Required
 version: 2
 
-formats:
-  - htmlzip
-
 build:
   image: latest
 
@@ -16,5 +12,8 @@
   install:
     - requirements: docs/requirements-docs.txt
 
+submodules:
+  include: all
+
 sphinx:
   configuration: docs/conf.py