docs: fix core team links in section in README

[ajitzero]

Summary
Fixes #2047

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of default theme, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

You have tested in the following browsers: (Providing a detailed version will be better.)

• Chrome
• Firefox
• Safari
• Edge
• IE

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated
• Related tests have been updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[ajitzero]

Fixed the links again, from /vue to /vuejs, but noticed a different sort of issue.

The users @filrak, @fatihacet and @farcaller don't have any commits in this repo. All these GitHub accounts exist, so I'm not sure what's happening.

[SigureMo]

@ajitzero Sorry, I didn't read the README.md carefully, it seems auto generated by All Contributors(see README.md line58), so you change the .all-contributorsrc as well. 😄

[ajitzero]

@SigureMo I've updated the .all-contributorsrc file. The README.md changes will get overwritten with this. That should be it.

[vue-bot]

Hey @ajitzero, thank you for your time and effort spent on this PR, contributions like yours help make Vue better for everyone. Cheers! 💚