Update docs folder in gitignore
[Docs] Minor edits to introduction
[Docs] Minor edits to Contributing
[Docs] Minor edits to Quick Start
[Docs] Add EnableCompressedResponses option and other minor edits to Connecting
[Docs] Update Cluster failover options
[Docs] Add DisbableAutomaticProxyDetection, EnableMetrics, and ThrowOnElasticsearchServerExceptions options to Connecting
Minor edits to Building Requests
[Docs] Updates to Handling Responses
[Docs] Updates to Errors
[Docs] Fixed link to Connecting section
[Docs] Remove highlighting of Elasticsearch