doc: move sections from guides

Move remaining items from guides into the appropriate locations using
the new structure.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

doc/develop/index.rst

@@ -10,6 +10,8 @@ Developing with Zephyr
    beyond-GSG.rst
    env_vars.rst
    application/index.rst
+   optimizations/index
    flash_debug/index
    modules.rst
    west/index
+   test/index

doc/guides/index.rst

@@ -7,10 +7,6 @@ User and Developer Guides
    :maxdepth: 1
 
    coccinelle.rst
-   code-relocation.rst
    platformio/index.rst
    portability/index.rst
    porting/index
-   test/index
-   tfm/index
-   optimizations/index

doc/kernel/index.rst

@@ -16,3 +16,4 @@ Kernel
    timeutil.rst
    util/index.rst
    iterable_sections/index.rst
+   code-relocation.rst

doc/services/index.rst

@@ -22,3 +22,4 @@ OS Services
    smf/index.rst
    storage/index.rst
    task_wdt/index.rst
+   tfm/index