Build GitHub Action: NEAR ABI Generator

Description

## Overview
Create a GitHub Action that generates ABI documentation from NEAR smart contracts.

## Why This Matters
Good documentation helps users. Auto-generated ABIs ensure docs stay current.

## Technical Requirements

### Action Usage
```yaml
- name: Generate ABI
uses: near-actions/generate-abi@v1
with:
contract-path: ./contracts
output: ./docs/abi.json
format: json # or markdown
```

## Deliverables
1. **ABI generator action**
2. **Multiple output formats**
3. **Documentation site integration**
4. **Documentation**

## Budget: 5 NEAR

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