Docs improvement

[obrusvit]

This PR fixes some minor issues and obsolete information in firmware documentation which I stumbled upon during my onboarding.

In addition, this PR adds a small script which lists markdown files present in docs/ which are not referenced in docs/SUMMARY.md - this is an effort to prevent a situation we had where I didn't know about "Hello World" tutorial because I didn't see it in the web version of the documentation. I referenced the "Hello World" tutorial now so I also rebased it on top of current main. The script currently lists:

• core/misc/disc1.md
• storage/addon-block.md
• python/show-text.md

[matejcik]

check_docs_summary should be added to one of the prebuild check CI steps. style_check most likely?

[obrusvit]

check_docs_summary should be added to one of the prebuild check CI steps. style_check most likely?
Agreed, added it to Makefile: 0b83095

However, I haven't yet linked the 3 missing files, they might be obsolete.

[matejcik]

Agreed, added it to Makefile: 0b83095

that doesn't help if it does not fail the CI step though. nobody reads the warnings no a green test

[matejcik]

• show-text.md should be dropped
• addon-block.md should be dropped (that's actually a very old design for the translation blob)
• disc1.md should be linked

[obrusvit]

Agreed, added it to Makefile: 0b83095

that doesn't help if it does not fail the CI step though. nobody reads the warnings no a green test

Ok. Now it fails loudly

And I removed the obsolete docs.

[obrusvit]

Rebased and added links for TOIF tool as requested AFK.

[obrusvit]

Rebased on main again.