Docs modify - #1384

- Enable ReadTheDocs versioning in .readthedocs.yaml with tag patterns and multiple formats
- Update version references from 0.6.0 to 0.7.0 across all platform guides
- Add comprehensive Enterprise content to platform guides:
  - AWS EMR: Full Community + Enterprise guide with JAR setup, Python packages, phases
  - GCP Dataproc: Enterprise tab with EArguments, EZinggWithSpark, blocking strategies
  - Microsoft Fabric: Enterprise tab with 7-notebook workflow, EC/ES packages
  - Snowflake: Complete Enterprise Snowflake guide with Snowpark, native execution
- Clean up placeholder comments:
  - Remove 22 'IMAGE TO BE ADDED' placeholders
  - Remove 'CONTENT TO BE GIVEN', 'TO BE ADDED', 'CHECK WITH SONAL' internal notes
  - Remove 'VIDEO TO BE ADDED' placeholder
- Fix broken links (e.g., /broken/pages/... -> proper references)
- Add missing frontmatter descriptions to 75+ markdown files
- Update Snowflake properties page with detailed parameter docs and key-pair auth
- Update install-zingg.md with AWS Glue, GCP Dataproc, Azure Synapse tabs
- Add GitHub Actions workflow for docs validation (markdown links, Sphinx build, frontmatter, version consistency)
- Remove TODO comments from verify-blocking.md and zingg-concepts README

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- Create new authoritative page: enterprise-snowflake-instructions.md with complete guide for running Zingg Enterprise natively on Snowflake using Snowpark
- Covers: Marketplace/manual installation, Snowpark session setup, Snowflake object creation (warehouse, database, stage, roles), B2B Customer Accounts and Enterprise Vendor Profiles configuration examples
- Includes MAPPING match type examples for company/vendor aliases (Alphabet Inc./Google LLC, Microsoft Corp/MSFT, Dell/EMC, etc.)
- Full pipeline: findTrainingData → label (Snowsight UI) → generateDocs → train → match → incremental matching
- Both Python and SQL APIs documented
- B2B score bands (0.90+ auto-merge, 0.75-0.89 steward review, 0.50-0.74 deep review, <0.50 separate)
- Monitoring via Snowflake Query History, security best practices (key-pair auth, network policies, column masking)
- Troubleshooting quick reference and performance tuning guide
- Update SUMMARY.md to include new page under Installing Zingg Enterprise for Snowflake
- Cross-link from connect-snowflake.md, platform-guide-for-snowflake.md, and install-zingg.md
- Update README.md for the Snowflake Enterprise installation section with proper frontmatter

- Add markdownlint to CI with a GitBook-compatible .markdownlint-cli2.jsonc
  config (only Docs Validation workflow step)
- Link Enterprise Snowflake cross-references to the correct relative paths
- Fix broken internal links (Sphinx-generated API index pages excluded via
  link-check config; dead /broken/ GitBook placeholder links removed)
- Add official Zingg YouTube demo embed and product screenshot placeholders
  to the Enterprise Snowflake instructions
- Convert remaining GitBook inline HTML tables to Markdown (41 tables in
  30 files) and replace   entities
- Clean up placeholder/garbage content across docs

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