change some links from `tree/master` to `blob/commit`

[dj8yfo]

As suggested in #1321 (comment), after #1321 is merged,
#1321 (comment) has to be resolved

[0xscharki]

May I handle this issue?

[Nanle100]

This is a nice project. I will love to work on this issue

[frol]

@0xscharki @Nanle100 We do not assign issues exclusively to first-time contributors anymore. Please, feel free to submit PRs and let's review from there.