Unify docs site visual style: reskin Material to match custom HTML pages

[RamyaGuru]

Closes #86.

Summary

Brings the MkDocs Material–rendered pages (/api-guide/, /getting-started/, /configuration/, tutorials) visually in line with the hand-written HTML pages at / and /daqiri-api.html, so the docs site reads as one design instead of two. Also reorganizes the loose image assets under docs/ and adds a light/dark mode toggle.

What's in this PR

Material reskin (f0ec838)

• docs/stylesheets/extra.css expanded from a ~70-line accent override sheet to a full Material override sheet. Maps the custom NVIDIA palette (--nv-bg-dark #0a0a0a, --nv-border #222222, --nv-text-pri #f0f0f0, etc.) onto Material's documented CSS variables (--md-default-bg-color, --md-code-bg-color, --md-default-fg-color, …).
• Adds rules for typography, inline and block code, tables, navigation, buttons, and the note / warning / info / tip admonition variants.
• mkdocs.yml: switches theme.font.text to Inter and theme.font.code to JetBrains Mono so Material loads the same fonts the custom pages declare.

Header logo and favicon (587b7f3)

• Wires the existing docs/logo.svg into theme.logo (replaces Material's default book icon) and docs/logo.png into theme.favicon.
• Sizes the rendered logo at 36px in extra.css to match the treatment on the custom HTML pages.

Asset reorg, typography polish, palette toggle (5f529ad)

• Moves docs/logo.{svg,png} and docs/architecture.svg into docs/images/. Updates theme.logo, theme.favicon, README.md, and embedded references in docs/index.html, docs/daqiri-api.html, and the extra.css comment.
• Shrinks the Material heading scale by ~30% on h1 / h2 and proportionally less on h3 / h4 so the heading hierarchy stays readable. Drops pre > code font-size to 0.72rem to match body text.
• Adds a light/dark scheme toggle via theme.palette using Material's brightness icons. Slate (dark) remains the default. Light mode currently falls back to plain Material defaults — the extra.css overrides are scoped to [data-md-color-scheme="slate"], so the NVIDIA reskin only applies in dark mode.

Out of scope

• Migrating docs/index.html and docs/daqiri-api.html to Markdown so URLs unify (.html vs trailing slash) and search indexes them.
• Generating daqiri-api.html from Doxygen on include/daqiri/daqiri.h to eliminate hand-maintained API drift.
• A custom Material home.html template to reproduce the landing-page hero/feature-card layout natively in MkDocs.
• Mirroring the dark-mode overrides for light mode so the NVIDIA branding carries across both schemes.

Test plan

• mkdocs build --strict (matches the CI gate in .github/workflows/docs.yml)
• scripts/check_html_links.py site
• scripts/check_doc_refs.py
• Visual diff /api-guide/ (Material-rendered) vs /daqiri-api.html (custom) — share palette, typography, code-block styling
• Visual diff /getting-started/ vs / (landing page) — same
• /tutorials/system_configuration/ — platform tabs (IGX Orin / DGX Spark) still work
• Header logo links to home; favicon shows in the browser tab
• Light/dark toggle in header flips palettes and persists across pages

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR unifies the visual style of the DAQIRI docs site by expanding docs/stylesheets/extra.css into a full Material override sheet that maps the custom NVIDIA dark palette onto Material's CSS variables, and updates mkdocs.yml to use Inter/JetBrains Mono fonts, the DAQIRI logo, and a light/dark toggle. A secondary commit reorganizes docs/logo.{svg,png} and docs/architecture.svg under a new docs/images/ subfolder, updating every consumer (README.md, mkdocs.yml, docs/index.html, docs/daqiri-api.html).

• All three commits carry the #86 - <Title> prefix and DCO Signed-off-by trailers.
• Image moves are consistently propagated to every HTML/YAML/Markdown reference; AGENTS.md does not enumerate individual image assets so no update is needed there.
• The NVIDIA dark-theme overrides are correctly scoped to [data-md-color-scheme="slate"]; light mode deliberately falls back to Material defaults (called out in the PR description as out of scope).

Confidence Score: 5/5

Documentation-only visual restyling with no source-code changes; all image moves are consistently reflected across every consumer.

All three commits are correctly signed off and follow the issue-prefixed title convention. The image asset reorg is complete — every HTML page, the README, and mkdocs.yml have been updated to the new images/ paths and there are no stale references in any markdown file. The CSS overrides are correctly scoped, the MkDocs logo/favicon paths are valid relative to docs_dir, and the light/dark toggle follows the pattern shown in Material's own documentation. Light-mode branding is intentionally deferred and clearly documented in the PR description.

No files require special attention.

Important Files Changed

Filename	Overview
docs/stylesheets/extra.css	Expanded from a ~70-line accent override to a full Material override sheet. All rules are correctly scoped to [data-md-color-scheme="slate"]; logo sizing rule intentionally applies to both schemes. Selector choices (e.g. :not(pre) > code vs pre > code) are sound.
mkdocs.yml	Adds logo/favicon (paths relative to docs_dir are correct), switches fonts to Inter/JetBrains Mono, and converts palette to a two-entry list enabling the brightness toggle. Icon selection (brightness-4 / brightness-7) matches Material's own documentation examples.
docs/index.html	All four image references (two logo in nav/footer, one hero logo, one architecture diagram) updated from docs-root to images/ subfolder. No other changes.
docs/daqiri-api.html	Single logo reference updated from logo.svg to images/logo.svg to match the asset reorg.
README.md	Inline logo reference updated from docs/logo.svg to docs/images/logo.svg. Documentation table is unchanged (no image entries, only markdown links).

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["Browser request"] --> B{"Color scheme?"}
    B -- "slate (default)" --> C["Material + NVIDIA overrides\nextra.css [data-md-color-scheme=slate]"]
    B -- "default (light)" --> D["Plain Material defaults\n(NVIDIA overrides not applied)"]
    C --> E["NVIDIA palette\n#0a0a0a bg, #76b900 green\nInter / JetBrains Mono"]
    D --> F["Material defaults\nblack primary, light-green accent\nInter / JetBrains Mono"]
    G["mkdocs.yml\ntheme.logo: images/logo.svg\ntheme.favicon: images/logo.png"] --> H["MkDocs Material build"]
    H --> B
    I["docs/images/\nlogo.svg · logo.png\narchitecture.svg"] --> G
    I --> J["docs/index.html\ndocs/daqiri-api.html\nREADME.md"]

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