doc: doc structure edits (#25821)

* doc: doc structure edits

Updated landing page for Guides with structure from guides/README.md.
Excluded guides/README.md from doxygen build, so it only shows in GH.
Added links to docs on the main README.md.

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

* Restyled by prettier-markdown

* misspell: add docbuild to ignored word list

Added docbuild to .wordlist.txt.

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

---------

Signed-off-by: Grzegorz Ferenc <Grzegorz.Ferenc@nordicsemi.no>
Co-authored-by: Restyled.io <commits@restyled.io>
diff --git a/docs/conf.py b/docs/conf.py
index 2434c39..bf83e21 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -12,7 +12,7 @@
 # -- Project information -----------------------------------------------------
 
 project = "Matter"
-copyright = "2022, Matter Contributors"
+copyright = "2020-2023, Matter Contributors"
 author = "Matter Contributors"
 version = "1.0.0"
 
@@ -31,6 +31,7 @@
     "examples/providers/README.md",
     "examples/thermostat/nxp/linux-se05x/README.md",
     "examples/common/m5stack-tft/repo",
+    "docs/guides/README.md",
 ]