The existing page had lots of references to specific products. Those references aren't in line with the current content guide, so I cut them out. I then reshaped the page to be a general set of advice about managing and running large clusters.
For some links that are invalid forever, this PR drops them.
* restructure left nav * Restructure setup left navigation * Update _redirects * Incorporated all the changes suggested * removed the Thumbs.db file
Tim Bannister
Qiming Teng
Karen Bradshaw
Rajakavitha1