doc: tools: add tools section and pages (#26262)

* doc: tools: add tools section and pages

Added tools section and pages in documentation.
This adds readmies for chip-cert and spake2p to the doc pool.

Signed-off-by: Grzegorz Ferenc <Grzegorz.Ferenc@nordicsemi.no>

* doc: move NXP manufacturing guide doc to fix links

Moved the NXP manufacturing data guide into docs/guides.
Added the guide to the doc pool and updated links.

Signed-off-by: Grzegorz Ferenc <Grzegorz.Ferenc@nordicsemi.no>

* Restyled by prettier-markdown

---------

Signed-off-by: Grzegorz Ferenc <Grzegorz.Ferenc@nordicsemi.no>
Co-authored-by: Restyled.io <commits@restyled.io>
diff --git a/docs/index.md b/docs/index.md
index 690386a..cd865b4 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -13,6 +13,7 @@
 guides/index
 style/index
 examples/index
+tools/index
 BUG_REPORT
 code_generation
 ERROR_CODES