[PATCH 3/9] index.rst: move the "Overview and Concepts" manual in the "Introduction and Overview" section

The Overview and Concepts manual contains introductory content which
feels like it should rather be in the first section of the welcome page,
rather than the "Manuals" section. Moreover, this section does not feel
like a manual either, so rename the section title to "Overview and
Concepts". Keep the "-manual" suffix to the directory name to avoid
breaking links, though.

Signed-off-by: Antonin Godard <[email protected]>
---
 documentation/index.rst | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/documentation/index.rst b/documentation/index.rst
index 9a5a83811..b7c04a581 100644
--- a/documentation/index.rst
+++ b/documentation/index.rst
@@ -29,6 +29,13 @@ Get started using the Yocto Project.
    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.
+
+.. toctree::
+   :maxdepth: 2
+
+   Overview and Concepts <overview-manual/index>
+
 Contributing to the Yocto Project
 =================================
 
@@ -51,7 +58,6 @@ infrastructure.
    :maxdepth: 1
    :caption: Manuals
 
-   Overview and Concepts Manual <overview-manual/index>
    Reference Manual <ref-manual/index>
    Board Support Package (BSP) Developer's guide <bsp-guide/index>
    Development Tasks Manual <dev-manual/index>

-- 
2.55.0