chore: add docs

[liukuijun666]

What does this PR do

add docs

Rationale for this change

This pull request includes several changes aimed at improving the documentation for the INFINI Agent. The most important changes involve the addition of configuration examples and parameter descriptions for various processors, as well as updates to the Makefile and configuration files to support the new documentation structure.

Documentation improvements:

• Added configuration examples and parameter descriptions for processors such as es_cluster_health, es_cluster_stats, es_index_stats, es_logs_processor, es_node_stats, and logs_processor (docs/content.en/docs/configuration/processors/es_cluster_health.md, docs/content.en/docs/configuration/processors/es_cluster_stats.md, docs/content.en/docs/configuration/processors/es_index_stats.md, docs/content.en/docs/configuration/processors/es_logs_processor.md, docs/content.en/docs/configuration/processors/es_node_stats.md, docs/content.en/docs/configuration/processors/logs_processor.md). [1] [2] [3] [4] [5] [6]

• Updated the Makefile to include targets for building and serving the documentation, as well as initializing the theme and configuring the environment (docs/Makefile).

Configuration updates:

• Added a new config.yaml file with detailed configuration settings for the documentation site, including theme settings, multilingual support, and menu configurations (docs/config.yaml).

• Updated the .gitignore file to exclude generated files and backup configurations (docs/.gitignore).

Content structuring:

• Added new sections for "Getting Started" and "Release Notes" to the documentation, providing a structured overview and historical context for the INFINI Agent (docs/content.en/docs/getting-started/_index.md, docs/content.en/docs/release-notes/_index.md). [1] [2]

Standards checklist

• The PR title is descriptive
• The commit messages are semantic
• Necessary tests are added
• Updated the release notes
• Necessary documents have been added if this is a new feature
• Performance tests checked, no obvious performance degradation

[medcl]

fix the path.