Add Release notes ClearML Server 1.5 and update AMIs (#253)

docs/release_notes/ver_1_5.md

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+---
+title: Version 1.5
+---
+
+### ClearML Server 1.5.0
+
+**New Features and Improvements**
+* Redesign UI tables info panel:
+    * Redesign experiment status banner
+    * Display all experiment tabs in single line
+    * Move experiment action buttons to the top right
+* Add UI adherence to user specified plot dimensions [ClearML GitHub issue #587](https://github.com/allegroai/clearml/issues/587)
+* Add row highlight to experiment textual comparison UI [ClearML GitHub issue #581](https://github.com/allegroai/clearml/issues/581)
+* Add UI "Delete" action for Pipelines
+* Add UI indicator for task and pipeline progress
+* Add UI API credentials label "Edit" action
+* Add option to create queues on-the-fly when enqueuing tasks in UI
+* Add "Number of Workers" column to UI queues table
+* Add pipeline results to UI dashboard search
+
+**Bug Fixes**
+* Fix UI experiment debug samples disappearing after refresh [ClearML Server GitHub issue #136](https://github.com/allegroai/clearml-server/issues/136)
+* Fix deleting tasks sometimes raises errors [ClearML GitHub issue #632](https://github.com/allegroai/clearml/issues/632)
+* Fix no progress indicator when performing off-screen selection in UI experiments table
+* Fix removing long pipeline tags doesn't work
+* Fix UI experiment scalar comparison graph titles are cropped with no available tooltips
+* Fix UI model table status column filters incorrectly when multiple statuses are selected. 
+* Fix unreadable plot data causes UI to crash
+* Fix UI project cards displaying incorrect task counts
+* Fix hover over system tags doesn't display full tag name
+* Fix `.txt` file debug sample previews are unreadable
+* Fix UI table/info-panel toggle doesn't update when clicking project breadcrumbs
+* Fix UI experiment debug samples leave artifacts when empty