readme: refactor asciinema link for video playback

[Guleri24]

Instead of opening the image directly, the commit refactors the asciinema image embedded link to redirect users to the corresponding video.

Signed-off-by: Abhishek Guleri abhishekguleri24@gmail.com

[rst0git]

@Guleri24 Thank you for the pull request!

Would it be possible to shorten the subject line of the git commit message to 50 characters? https://cbea.ms/git-commit/#limit-50

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.21 :warning:

Comparison is base (4c2b71c) 70.54% compared to head (2dc7559) 70.33%.

:exclamation: Current head 2dc7559 differs from pull request most recent head aefcf21. Consider uploading reports for the commit aefcf21 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## criu-dev #2221 +/- ## ============================================ - Coverage 70.54% 70.33% -0.21% ============================================ Files 133 133 Lines 33552 33989 +437 ============================================ + Hits 23670 23907 +237 - Misses 9882 10082 +200 ``` [see 16 files with indirect coverage changes](https://app.codecov.io/gh/checkpoint-restore/criu/pull/2221/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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[Guleri24]

Hi @rst0git, I have made the necessary changes. Could you please take a look at them?