fix GH#15160: Add Bilibili links alongside YouTube ones

[HowardC2019]

Resolves: #15160

I added hard-coded links to minimise the change to existing code. The reasons for this change is stated in the issue thread.

• [x] I signed the CLA
• [x] The title of the PR describes the problem it addresses
• [x] Each commit's message describes its purpose and effects, and references the issue it resolves
• [x] If changes are extensive, there is a sequence of easily reviewable commits
• [x] The code in the PR follows the coding rules
• [x] There are no unnecessary changes
• [x] The code compiles and runs on my machine, preferably after each commit individually
• [ ] I created a unit test or vtest to verify the changes I made (if applicable)