Updated website documentation (#334)

* Updated website documentation

* Updated some documentation and fixed links

* small updates

* small updates

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+Checkpointing is a technique to reduce the impact of machine failure. 
+When using Checkpointing, tasks make periodical snapshots of their state.
+If a task fails, it can be restarted from the last snapshot instead of starting from the beginning.
+
+A user can define a checkpoint model using the following parameters:
+
+| Variable                  | Type   | Required? | Default | Description                                                                                                          |
+|---------------------------|--------|-----------|---------|----------------------------------------------------------------------------------------------------------------------|
+| checkpointInterval        | Int64  | no        | 3600000 | The time between checkpoints in ms                                                                                   |
+| checkpointDuration        | Int64  | no        | 300000  | The time to create a snapshot in ms                                                                                  |
+| checkpointIntervalScaling | Double | no        | 1.0     | The scaling of the checkpointInterval after each successful checkpoint. The default of 1.0 means no scaling happens. |
+
+### Example
+
+```json
+{
+    "checkpointInterval": 3600000,
+    "checkpointDuration": 300000,
+    "checkpointIntervalScaling": 1.5
+}
+```
+
+In this example, a snapshot is created every hour, and the snapshot creation takes 5 minutes.
+The checkpointIntervalScaling is set to 1.5, which means that after each successful checkpoint, 
+the interval between checkpoints will be increased by 50% (for example from 1 to 1.5 hours).