config.toml has mixture of zh and en references causing website issues

https://github.com/apache/dubbo-website/blob/a3bc6c46c78fb9088b27e8dd512e2e6be381707b/config.toml#L11

There is a single config.toml file which defaults to zh but has some en references.

This leads to various incorrect links on the website.

For example, the Releases dropdown on https://dubbo.apache.org/en/ leads to pages under zh/docs.

Start with config.toml around line 11 and compare its language references with the /en/ and /zh/ website paths. Check the Releases dropdown from https://dubbo.apache.org/en/ and trace any links that incorrectly lead under zh/docs. Done means the affected English links resolve to the intended English pages without breaking the Chinese paths.

Written by the indexing model from the issue text.