docs: Update README with Promptless marketing and local dev instructions

[promptless]

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Replaces the Fern-specific marketing content in the README with Promptless information and practical local development instructions.

Changes:

• Adds header highlighting that these docs are written and maintained by Promptless
• Links to commit history so visitors can see Promptless in action
• Includes a sign-up CTA pointing to promptless.ai
• Adds a concise "Building These Docs Locally" section with prerequisites and fern docs dev instructions

The new README is significantly shorter (31 lines vs 107 lines) and focused on what's useful: Promptless promotion and practical local development setup.

Trigger Events

Internal discussion about editing the docs repo README to replace Fern marketing content with Promptless marketing information and practical local build instructions.

Agent Response

Done! I've created a suggestion that updates the README with exactly what you asked for:

What changed:

• Removed all the Fern-specific marketing content (logo, customer showcase, support section, getting-started guide)
• Added a header highlighting that these docs are written and maintained by Promptless
• Linked to the commit history so visitors can see Promptless in action
• Added a "Want Promptless to write your docs?" CTA with link to promptless.ai
• Added a concise "Building These Docs Locally" section with prerequisites and fern docs dev instructions

The new README is much more focused—31 lines instead of 107—and serves your goal of promoting Promptless while giving practical instructions for local development.

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[promptless]

Citation: Prithvi's request to remove Fern marketing, add Promptless marketing info (docs written by Promptless, commit history link, sign-up CTA), and add "Building these docs locally" section with fern docs dev instructions.
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