docs: add Spanish (es) translation support for the website

[arnavgogia20]

Task description:
The Kmesh website currently supports documentation in English and Chinese. To improve accessibility and reach a wider global audience, this task proposes adding Spanish (es) translation support to the website using the existing Docusaurus i18n setup.

The initial focus will be on setting up the Spanish locale and translating a small set of core pages (such as the homepage and documentation overview), with the possibility to expand translations incrementally.

Solution:

• Add Spanish (es) as a supported locale in the Docusaurus configuration
• Create the initial i18n folder structure for Spanish
• Translate key entry pages (home, docs overview, basic navigation)
• Ensure the site builds and renders correctly with the new locale

This task does not require changes to core application logic and is well-suited for documentation-focused contributions.

Who can join or take the task:
This is a good first issue intended for first-time contributors who want to get familiar with:

• The Kmesh website repository
• Docusaurus i18n structure
• Open source documentation workflows

Basic knowledge of Markdown is sufficient. Prior experience with translations or Docusaurus is helpful but not required.

How to join or take the task:
Just reply on the issue with the message /assign in a separate line.
Then, the issue will be assigned to you.

How to ask for help:
If you need help or have questions, please feel free to ask on this issue.
The issue author or other members of the community will guide you through the contribution process.

[arnavgogia20]

Hii @YaoZengzeng @hzxuzhonghu , i'd be glad to work on this issue if you approve for me to continue and assign it to myself

[arnavgogia20]

/assign

[yashisrani]

i think, we don't need Spanish translation support ..