[PATCH 4/9] index.rst: move external links to the bottom of the intro section

These two links contain more introductory resources to the project and
are external to yocto-docs, but currently break the flow of the
introduction:

- The "Yocto Project Technical Overview" from https://www.yoctoproject.org
  is essentially the same as our "Introducing the Yocto Project" section
  of the Overview and Concepts manual but with less details.

- The Tips and Tricks wiki page contains a lot of old and obsolete
  information, and the wiki is bound to be deprecated at some point.

Additionally, hide them from the sidebar by not including them in a
toctree.

Signed-off-by: Antonin Godard <[email protected]>
---
 documentation/index.rst | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/documentation/index.rst b/documentation/index.rst
index b7c04a581..4cc9d4582 100644
--- a/documentation/index.rst
+++ b/documentation/index.rst
@@ -26,8 +26,6 @@ Get started using the Yocto Project.
    Quick Build <brief-yoctoprojectqs/index>
    what-i-wish-id-known
    transitioning-to-a-custom-environment
-   Yocto Project Technical Overview <https://www.yoctoproject.org/development/technical-overview/>
-   Tips and Tricks Wiki <https://wiki.yoctoproject.org/wiki/TipsAndTricks>
 
 Get familiar with the development environment and concepts of the Yocto Project.
 
@@ -36,6 +34,11 @@ Get familiar with the development environment and concepts of the Yocto Project.
 
    Overview and Concepts <overview-manual/index>
 
+Additional introductory resources.
+
+-  `Technical Overview (external website) <https://www.yoctoproject.org/development/technical-overview/>`__
+-  `Tips and Tricks Wiki (external website) <https://wiki.yoctoproject.org/wiki/TipsAndTricks>`__
+
 Contributing to the Yocto Project
 =================================
 

-- 
2.55.0