fix: General cleanup

[cshilwant]

fix(system): Drop User Guide for Servo Drive Demo

This Demo is no longer maintained & included in any of the toc tree.
Hence, purge the user guide along with associated images

Signed-off-by: Chirag Shilwant <c-shilwant@ti.com>

fix: Switch from relative links to :ref: for cross-referencing

Use :ref: for cross-referencing to arbitrary locations in the entire document

Signed-off-by: Chirag Shilwant <c-shilwant@ti.com>

[cshilwant]

Documentation preview at - https://cshilwant.github.io/processor-sdk-doc/

[github-actions]

New warnings found with rstcheck:

source/devices/AM62X/linux/Release_Specific_Migration_Guide.rst:49: (SEVERE/4) Problems with "include" directive path:

[cshilwant]

Baby steps to unblock - #16

[cshilwant]

New warnings found with rstcheck:

source/devices/AM62X/linux/Release_Specific_Migration_Guide.rst:49: (SEVERE/4) Problems with "include" directive path:

@StaticRocket This seems to be a maskable warning - sphinx-doc/sphinx#11755?

[AashvijShenai]

@cshilwant
I notice that AM62AX docs did not get this update. Is this intentional? (devices/AM62AX/linux/Release_Specific_Migration_Guide.rst, devices/AM62AX/linux/Overview/Build_and_Run_the_Demos.rst)

Also these files: linux/Foundational_Components/Kernel/Kernel_Drivers/Audio.rst, linux/Foundational_Components/Kernel/Kernel_Drivers/Display/DSS7.rst.

I'm assuming you're unconcerned about non AM62** devices?

[cshilwant]

@cshilwant I notice that AM62AX docs did not get this update. Is this intentional? (devices/AM62AX/linux/Release_Specific_Migration_Guide.rst, devices/AM62AX/linux/Overview/Build_and_Run_the_Demos.rst)

Also these files: linux/Foundational_Components/Kernel/Kernel_Drivers/Audio.rst, linux/Foundational_Components/Kernel/Kernel_Drivers/Display/DSS7.rst.

I'm assuming you're unconcerned about non AM62** devices?

@AashvijShenai There are many more instances where relative links are being used (apart from the one's you highlighted).
As mentioned in #128 (comment), just addressed few of those which were known to me.

Also, handling relative links in single PR won't be feasible as it would start throwing merge conflicts in almost everyone's PR

[StaticRocket]

New warnings found with rstcheck:

source/devices/AM62X/linux/Release_Specific_Migration_Guide.rst:49: (SEVERE/4) Problems with "include" directive path:

@StaticRocket This seems to be a maskable warning - sphinx-doc/sphinx#11755?

Eh, kind of. That issue is more about providing valid absolute paths to break out of the project SOURCEDIR. Our absolute paths are supposed to be relative to the SOURCEDIR so multilevel includes and other odd things behave correctly. I think it's safe to ignore these rstcheck errors for now so long as we can verify that the path is valid. I may have a look around what's causing that if I get bored.