Improve theme granularity; Full RSC support; Doc example fixes

[SutuSebastian]

• I have followed the Your First Code Contribution section of the Contributing guide

Changes

• add granular theme override for: Datepicker, Dropdown, Modal, Navbar, Rating, Sidebar, Table, Timeline, Toast
• fixed TableBody theme prop to receive FlowbiteTableBodyTheme instead of FlowbiteTableCellTheme

Extras

• remove redundant PropsWithChildren
• fixed avatar.stackedLayout.tsx code example
• fixed rating.advanced.tsx code example
• code formatting consistency
• add sharp for image optimisations
• components - explicit exports; avoid "component undefined" error in RSC (see, Next.js 13 - appDir - Error: Unsupported Server Component type: undefined vercel/next.js#41940, [NEXT-622] Reexporting client components causes them to be undefined vercel/next.js#46293, [Next 13] Why do I have to mark this page as client component? vercel/next.js#46227)
• tests: add typesafety to custom theme object

API changes

• Navbar theme object contains all styles for all Navbar sub-components (like it should've from the beginning)
• Sidebar theme object items and itemsGroup are now objects and have base (eg: items: { base: '...' }) instead of plain string
• Timeline theme object theme.item.content.[body, time, title] are now objects with { base: '...' } instead of plain string

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
flowbite-react	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 6, 2023 10:36am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7461173) 99.54% compared to head (1a8745f) 98.71%.
Report is 136 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1104      +/-   ##
==========================================
- Coverage   99.54%   98.71%   -0.83%     
==========================================
  Files         163      173      +10     
  Lines        6621     7966    +1345     
  Branches      401      474      +73     
==========================================
+ Hits         6591     7864    +1273     
- Misses         30      102      +72     

see 149 files with indirect coverage changes

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