feat: add streams guide (#7123)

* feat: add streams guide

Co-authored-by: Matteo Collina <matteo.collina@gmail.com>

* Apply suggestions from code review

Add authors and original content attribution

Signed-off-by: Carlos Espa <43477095+Ceres6@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Aviv Keller <redyetidev@gmail.com>
Signed-off-by: Carlos Espa <43477095+Ceres6@users.noreply.github.com>

* fixup! Apply suggestions from code review

* fixup! fixup! Apply suggestions from code review

---------

Signed-off-by: Carlos Espa <43477095+Ceres6@users.noreply.github.com>
Co-authored-by: Matteo Collina <matteo.collina@gmail.com>
Co-authored-by: Claudio W <cwunder@gnome.org>
Co-authored-by: Aviv Keller <redyetidev@gmail.com>

Author: 4 people

apps/site/navigation.json

@@ -330,6 +330,10 @@
               "link": "/learn/modules/abi-stability",
               "label": "components.navigation.learn.modules.links.abiStability"
             },
+            "howToUseStreams": {
+              "link": "/learn/modules/how-to-use-streams",
+              "label": "components.navigation.learn.modules.links.howToUseStreams"
+            },
             "backpressuringInStreams": {
               "link": "/learn/modules/backpressuring-in-streams",
               "label": "components.navigation.learn.modules.links.backpressuringInStreams"