DOC-12351 Add or Remove Services and Rebalance

[rao-shwe]

DOC-12351

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Main content changes:

• What's New entry.
• Added new content and rewrote existing content in Services. - Learn section.
• New page - Adding or Removing the Data Service on Existing Nodes. - Manage section.
• New page - Modify Services and Rebalance. - Manage section.
• New page - Assigning Services on an Existing Node. - REST API section.
• New page - Getting Memory Information. - REST API section.

Updated the following pages to mention add/remove services:

• Learn section
  -- Nodes.
  -- Data Service.
  -- Query Service.
  -- Index Service.
  -- Search Service.
  -- Analytics Service.
  -- Eventing Service.
  -- Backup Service.
• Manage section - Manage Nodes and Clusters.
• REST API section
  -- Initializing a Cluster.
  -- Initializing a Node.
  -- Establishing Credentials.
  -- Naming a Node.
  -- Configuring Memory.
  -- Naming a Cluster.
  -- Assigning Services to a New Node.
  -- Adding Nodes to Clusters.
  -- Rebalancing the Cluster.

[hyunjuV]

@rao-shwe
Just a few additional changes.

[hyunjuV]

@rao-shwe
I suggested a name change for the new page you added -- the "Manage Data Service and Rebalance" is too broad (will be confusing) for the narrow topic. Anyways, the rest look good, so I'll approve. Thanks for all the links/references changes and updates, as well as the core feature documentation -- I think that people will appreciate the effort when they can find the info they need easily.

[sarahlwelton]

Let me know if you want to discuss any of these changes. Please make sure you're running Vale either while you're writing, or before opening a PR.

[rao-shwe]

Let me know if you want to discuss any of these changes. Please make sure you're running Vale either while you're writing, or before opening a PR.

Thanks @sarahlwelton. I'm good. Vale will be on but sometimes I miss a few minor things. I'll be more careful from now on.