fix(ui): scale Savanna and Classic body text to 95%

[ngarakapati]

Summary

• Savanna and Cloud Classic were scaled to 90% (0.9em), which made body copy too small.
• Raise the theme-cloud root scale to 95% (0.95em, ~15.2px).
• Keep the shared header and footer at the 16px size used by the rest of docs.tigergraph.com.
• Rebuild ui-bundle.zip so the next doc-site build picks this up.

Test plan

• Hard-refresh a Savanna page (for example Overview) and confirm body text is slightly larger than 90%, still smaller than 100%.
• Check a Cloud Classic page and confirm the same scale.
• Confirm the top nav (logo, search, CTAs) and footer still match other product docs.
• After merge, the next doc-site Netlify build uses the updated ui-bundle.zip.

[Tushar-TG-14]

@ngarakapati Since this changes the html.theme-cloud root font size, it affects all rem-based sizing in the Cloud theme, not just body text. Could you also verify that the sidebar/navigation, toolbar, tabs, headings, and other rem-based spacing/sizing don't change unexpectedly at 95%?
The header/footer are explicitly compensated, but we want to make sure there aren't other layout regressions.