[Meta] Restructure the TOC to make it easier for users to find content

[hdhalter]

As we grow our content, we need to have the right structure in place. This issue documents the planned updates to the TOC in the current structure. Further improvements will be made once we move to a new site design.

Here is a draft of the proposed updated navigation:

• Getting Started with OpenSearch
  Introduction to OpenSearch
  Version History
  Breaking Changes

• Installation and Configuration
  Installing OpenSearch (Tarball, Docker, Helm, RPM, Ansible Playbook)
  Installing OpenSearch Plugins
  Migrating/Upgrading to OpenSearch
  Configuring OpenSearch
  Installing and Configuring OpenSearch Dashboards (Tarball, Docker, Helm, RPM)
  Installing Dashboards Plugins

• OpenSearch Dashboards
  Get Started
  Discover
  Dashboard
  Visualize
  Report and Share
  Alert and Detect
  Management

• Security (About Security)
  Configuring Security
  Authentication
  Access Control
  Auditing

• Index and Ingestion
  Index Templates
  Units and Data Types
  Indexing APIs
  Reindexing
  Index Aliases
  Data Streams
  Index Management
  Ingestion Nodes
  Segment Replication
  Field Types

• Observability
  Event Analytics
  Operational Panels
  Piped Processing Language
  Notebooks
  Trace Analytics
  Log Analytics
  Security Analytics
  Anomaly Detection Synthetics

• Search and Query
  Search Query Types
  Query DSL: Fuzzy Query
  Search Templates
  Autocomplete
  Paginate Results
  Scroll
  Sort
  Highlight Matches
  Asynchronous Search
  Cross Cluster Search
  Machine Learning
  KNN
  Aggregations
  Indexing back pressure
  SQL
  Cluster settings
  Learn to Rank

• Availability and Recovery
  Snapshots
  Cluster Replication
  Get Started
  Auto-follow
  Permissions
  Settings
  Cross-cluster replication API

• Manage, Monitor, and Tune
  Stack Management
  Performance Analyzer
  From OpenDistro
  Alerting
  Notifications
  Anomaly Detection

• Machine Learning
  ML Lifecylcle
  ML Commons API
  Supported Algorithms

• Clients
  Python client
  .NET clients
  Ruby client
  Perl client
  Rust client
  JavaScript client
  Java High-Level REST client
  Java client
  PHP client
  Go client

• Tools
  OpenSearch CLI
  Data Prepper
  Agents and Ingestion Tools
  Grafana
  Logstash

• OpenSource API Reference
  REST APIs
  Common REST parameters
  Popular APIs

• Troubleshooting

• Developer Guides (links to Javadocs, Dashboards, OpenSearch, Security)

[hdhalter]

• Target completion = end of Q4
• We'll backport all changes to v2.0
• All changes will go to a separate branch for testing
• TOC changes will be done section by section in order to work with authors so there's no overlap
• We will add redirects and check for any broken links
• May introduce a script to manage linking
• We'll create a schedule for when we will tackle each section

[Naarcha-AWS]

Added Due Dates to each line item, with an eye to categorizing each based on like sections.

[Naarcha-AWS]

Here's a linear view of estimated section completion dates:

10/14/2022 ------> 10/24/2022

• API Reference

10/19/2022 ------> 10/26/2022

• Clients
• Tools

10/21/2022 ------> 10/28/2022

• Index and Ingestion
• Availability and Recovery

10/26/2002 -----> 11/2/2022

• Getting Started
• Installation and Configuration

10/28/2022 -----> 11/9/2022

• Security

11/2/2022 ----> 11/14/2022

• Observability

11/4/2022 ----> 11/18/2022

• Search and Query

11/16/2022 ----> 11/23/2022

• Dashboards

[Naarcha-AWS]

Based on the work for the API reference section, I'm adjusting the dates for each section to leave additional room between sections and to allow additional time to complete the task.

New ETA: 11/23/2022

[hdhalter]

Here is the updated PR for the installation and configuration section: #2130

[Naarcha-AWS]

Completed by #2946