courses: B35APO and B4M35PAP add link to advertisements free recordings copy at VHSky.cz

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>

Author: ppisa

content/courses/fel/b35apo/index.md

@@ -14,7 +14,7 @@ Subject provides overview of basic building blocks of computer systems.  Explana
 
 - LaTeX Beamer Slide [sources at CTU FFE GitLab](https://gitlab.fel.cvut.cz/b35apo/apo-slides/) and [GitHub CTU CompArch Slides](https://github.com/cvut/comparch-slides)
 
-- [Lecture videos (English 2023/2024/2025 WIP, YouTube)](https://www.youtube.com/playlist?list=PLQL6z4JeTTQl3tUGV5kM5Wt9ziZrV-fpI)
+- [Lecture videos (English 2023/2024/2025 WIP, YouTube)](https://www.youtube.com/playlist?list=PLQL6z4JeTTQl3tUGV5kM5Wt9ziZrV-fpI) advertisements free alternative at [VHSky.cz](https://vhsky.cz/my-library/video-playlists/8Ejstt3Tfh8mWGcjQcEL2S)
 
 - [Lecture videos (English 2021/2023, YouTube)](https://www.youtube.com/playlist?list=PLQL6z4JeTTQnTrML7HgagbjdpCtvdyu0M)
 

content/courses/fel/b4m35pap/index.md

@@ -10,7 +10,7 @@ title:  "FEL: B4M35PAP Advanced Computer Architectures"
 
 - [Course page (English)](https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start) ([Lectures](https://cw.fel.cvut.cz/wiki/courses/b4m35pap/lectures/start))
 
-- [Lecture videos (Czech, YouTube)](https://www.youtube.com/playlist?list=PLQL6z4JeTTQla6OFD1JAAtAt7Zw_3Ys61)
+- [Lecture videos (Czech, YouTube)](https://www.youtube.com/playlist?list=PLQL6z4JeTTQla6OFD1JAAtAt7Zw_3Ys61), advertisements free alternative at [VHSky.cz](https://vhsky.cz/my-library/video-playlists/6akpEt7UVq3k6NzXdsY5Hd)
 
 - [Templates and examples for seminaries (GIT)](https://gitlab.fel.cvut.cz/b4m35pap/stud-support)