fix(ui): make mermaid diagrams readable in dark mode

[Anshumancanrock]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Site defaults to dark mode but Mermaid diagrams were still stuck on the light theme, which made them pretty hard to read. A couple of the blog posts also had light node colors hardcoded.

Now it just sets the mermaid light/dark themes in docusaurus.config.js and moves those node colors into CSS so they actually respect the color mode. Also updated the ZH copies of the blogs.

Tested locally with npm run lint, npm run format:check, and npm run build for both en and zh. Checked the isolation blog post and the architecture docs in both light and dark mode.

Which issue(s) this PR fixes:

Fixes #769

Checklist:

• npm run lint and npm run format:check pass
• npm run build succeeds for both en and zh
• Chinese translation updated if English docs changed (or noted why not)
• Commits are signed off (git commit -s)

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This pull-request has been approved by: Anshumancanrock
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📥 Commits

Reviewing files that changed from the base of the PR and between dd9c129 and ced895a.

📒 Files selected for processing (6)

• blog/hami-core-adopted-by-nvidia-kai-scheduler/index.md
• blog/kai-scheduler-hami-gpu-memory-hard-isolation/index.md
• docusaurus.config.js
• i18n/zh/docusaurus-plugin-content-blog/hami-core-adopted-by-nvidia-kai-scheduler/index.md
• i18n/zh/docusaurus-plugin-content-blog/kai-scheduler-hami-gpu-memory-hard-isolation/index.md
• src/css/custom.css

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