example with mkdocs

[SamYuan1990]

as discussed on today's community session
here is a local preview for mkdocs version of HAMi document.
feature list

- index page
Nav
- Documentation
    core conceptes
        what's
        arch
- Blog
- Changelog

- search
- i18n for zh and en

It has to be a breaking change, so with this PR, just have a version of us to discuss.
for maintainers, please run locally to try with it.

related with #94

[hami-robot]

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[windsonsea]

If the need is only for handling image resources, adopting a new website builder isn’t really necessary.
Major breaking changes usually introduce more issues and bugs.