fix: remove the broken ECMA version badge

[chenjiahan]

Summary

Remove the ECMA version badge, because:

• This feature seems to have been broken for a long time:

• We should calculate the ECMA version on the Node side rather than the client side, as it requires acorn and some other Node.js modules, and we can not guarantee that they will work as expected in the browser.
• We will improve the Node side ECMA version checking with this PR: [Feature]: optimize the ecma version check. #532

Bundle size

This change can reduce the size of the client bundle, as acorn has been removed from the bundles:

• before:

• after:

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