refresh sidebar, intro, dimOS branding

[swstica]

Problem

• Sidebar had main features buried
• dimOS was referred as DimOS

Solution

• Restructure docs sidebar toward product journey
• Tighten intro/quickstart copy; add X demo cards;
• DimOS → dimOS in docs

Checklist

• I have read and approved the CLA.

[mintlify]

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Project	Status	Preview	Updated (UTC)
dimensional	🟢 Ready	View Preview	Aug 10, 2026, 6:47 PM

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

@@            Coverage Diff             @@
##             main    #3429      +/-   ##
==========================================
- Coverage   76.09%   76.08%   -0.01%     
==========================================
  Files        1190     1190              
  Lines      115295   115295              
  Branches    10367    10367              
==========================================
- Hits        87729    87725       -4     
- Misses      24554    24556       +2     
- Partials     3012     3014       +2     

Flag	Coverage Δ
OS-ubuntu-24.04-arm	70.15% <ø> (-0.01%)	⬇️
OS-ubuntu-latest	72.15% <ø> (-0.01%)	⬇️
Py-3.10	72.14% <ø> (+<0.01%)	⬆️
Py-3.11	72.14% <ø> (-0.01%)	⬇️
Py-3.12	72.14% <ø> (-0.01%)	⬇️
Py-3.13	72.14% <ø> (-0.01%)	⬇️
Py-3.14	72.14% <ø> (-0.01%)	⬇️
Py-3.14t	72.14% <ø> (-0.01%)	⬇️
SelfHosted-Large	29.66% <ø> (ø)
SelfHosted-Linux	35.83% <ø> (-0.02%)	⬇️

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see 1 file with indirect coverage changes

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