Remove support for inline components and block components shorthand?

[KeroZhai]

Clear and concise description of the problem

There is no longer inline components in MDC syntax, so maybe de-implement this feature?

Besides, this syntax conflicts with markdown-it-emoji, like :laughing:.

Suggested solution

Remove support for inline components.

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[KeroZhai]

Also, block components shoud start with :: instead of :(shorthand).