Add features support comparison table to README

[Copilot]

Adds a structured comparison of framework capabilities to help users evaluate tradeoffs between bundle size and feature availability.

Changes

• Features table with 7 structural capabilities:
  • SSG, SSR, Streaming SSR, API Routes, Server Actions, File-based Routing, Code Splitting
• 17 frameworks ordered by bundle size (matching chart)
• Support indicators: ✅ fully supported, ⚠️ partial, ❌ not supported
• Documentation links for verification where applicable

Example

Framework	SSG	SSR	Streaming SSR	API Routes	Server Actions	File-based Routing	Code Splitting
Next.js 16	✅	✅	✅	✅	✅	✅	✅
React 19	❌	❌	❌	❌	❌	❌	⚠️
Svelte	❌	❌	❌	❌	❌	❌	❌

Enables users to select frameworks based on required features rather than bundle size alone.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add features support comparison</issue_title>
<issue_description>The chart displays the difference in bundle size for each framework, but we can assume that the heavier a framework is, the more features it has. It would be interesting to see a table showing what features are available in each framework, in order to choose a framework based on the features we need and the weight we can accept.

Expectations

1. create a list of important features that JS frameworks can have. They should be structural features, like SSG, Streaming SSR, server actions, api routes, etc. There should be around 5-10 features.
2. in the README.md, add a section "Features" containing a table with the chosen features in columns and all 17 frameworks in rows. Order the frameworks in the same order as the graph
3. for each cell of the table, indicate if the framework supports the feature : totally (✅), partially (⚠️), not at all (❌)
4. if possible, in each cell provide a link to the documentation of the feature in the framework, so that we can verify it</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add features support comparison #2

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