Add element modifiers for picture and images

[bmiit145]

Fixes #366

Add element modifiers prose-picture:* and prose-images:* to target <picture> and <img> <picture> respectively.

• Modify src/index.js to include element modifiers for prose-picture:* and prose-images:*.
• Update README.md to list prose-picture:* and prose-images:* as available element modifiers.
• Add default styles for prose-picture:* and prose-images:* in src/styles.js.
• Add tests for the new element modifiers prose-picture:* and prose-images:* in src/index.test.js.

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Name	Status	Preview	Comments	Updated (UTC)
tailwindcss-typography	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 9, 2025 1:02pm

[philipp-spiess]

Hey! Thanks but going to close this in favor of #367 👍