Fixes#1404
Two sets of fixes:
- add conditionals for windows and linux where shared
- search/replace for linux only (MinIO Server reference pages)
Staging server not available, tested/checked locally
Closes#535
- Updates MinIO Console doc section on the Support tab
- Adds info to several pages that Prometheus metrics displayed in the
console can now be downloaded
- Adds that bucket notification targets can now be deleted from the
console
- Updates the MinIO Console page to reflect the current navigation
layout by moving around sections and updating screenshots