Add resource usage timeline diagrams to README

- Added Mermaid XY charts showing memory usage over time
- Individual charts for Elixir, TypeScript, Dart, Haskell, C
- Comparison chart for fast languages
- Shows how memory usage varies during program execution
- Based on actual timeline data from benchmark runs

timelines/JavaScript/run_1.tsv

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timelines/JavaScript/run_2.tsv

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timelines/JavaScript/run_3.tsv

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timelines/JavaScript/run_4.tsv

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