📚 Add n8n documentation page

docs/configuration.md

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+
+# Configuration
+
+It is possible to change some of the n8n defaults via special environment variables.
+The ones that currently exist are:
+
+
+## Execution Data Manual Runs
+
+Normally executions which got started via the Editor UI will not be saved as
+they are normally only for testing and debugging. That default can be changed
+with this environment variable.
+
+```bash
+export EXECUTIONS_DATA_SAVE_MANUAL_EXECUTIONS=true
+```
+
+This setting can also be overwritten on a per workflow basis in the workflow
+settings in the Editor UI.
+
+
+## Execution Data Error/Success
+
+When a workflow gets executed it will save the result in the database. That is
+the case for executions that did succeed and for the ones that failed. That
+default behavior can be changed like this:
+
+```bash
+export EXECUTIONS_DATA_SAVE_ON_ERROR=none
+export EXECUTIONS_DATA_SAVE_ON_SUCCESS=none
+```
+
+Possible values are:
+ - **all**: Saves all data
+ - **none**: Do not save anything (recommended if a workflow runs a very often and/or processes a lot of data, set up "Error Workflow" instead)
+
+These settings can also be overwritten on a per workflow basis in the workflow
+settings in the Editor UI.
+
+
+## Exclude Nodes
+
+It is possible to not allow users to use nodes of a specific node type. If you, for example,
+do not want that people can write data to disk with the "n8n-nodes-base.writeBinaryFile"
+node and can not execute commands with the "n8n-nodes-base.executeCommand" node you can
+set the following:
+
+```bash
+export NODES_EXCLUDE="[\"n8n-nodes-base.executeCommand\",\"n8n-nodes-base.writeBinaryFile\"]"
+```
+
+
+## Timezone
+
+The timezone is set by default to "America/New_York". It gets for example used by the
+Cron-Node to know at what time the workflow should be started at. To set a different
+default timezone simply set `GENERIC_TIMEZONE` to the appropriate value like for example
+for Berlin (Germany):
+
+```bash
+export GENERIC_TIMEZONE="Europe/Berlin"
+```
+
+You can find the name of your timezone here:
+[https://momentjs.com/timezone/](https://momentjs.com/timezone/)