docs: add community-contributed config_vars (#491)

* docs: testing experimental structure

Signed-off-by: chjmil <[email protected]>

* Update experimental prefix

* Update experimental_config_vars.md

* Update experimental_config_vars.md

* docs: reword warning

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* Add cautionary note syntax

* docs: change warning phrasing

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* docs: restructure

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* docs: phrasing

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* docs: restructure warning

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* docs: add community

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* docs: lowercase

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* Update community_config_vars.md to fix grammar

* Update community_config_vars.md

* docs: remove experimental

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---------

Signed-off-by: chjmil <[email protected]>
Co-authored-by: Bryan Behrenshausen <[email protected]>

Author: saschjmil

docs/community/community_config_vars.md

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+# Community-Contributed Configuration Variables
+
+Community-contributed configuration variables are listed in the tables below. These variables can also be specified on the terraform command line.
+
+> [!CAUTION]
+> Community members are responsible for maintaining these features. While project maintainers will verify these features work as expected when merged, they cannot guarantee future releases will not break them. If you encounter issues while using these features, start a [GitHub Discussion](https://github.com/sassoftware/viya4-iac-azure/discussions) or open a Pull Request to fix them. As a last resort, you can create a GitHub Issue.
+
+## Table of Contents
+
+* [Spot Nodes](#spot_nodes)
+
+<a name="spot_nodes"></a>
+## Spot Nodes
+
+Here is some information about spot nodes.
+
+Here is a warning about why they might cause issues.
+
+Here is a table with the variables you would use to configure them
+
+| Name | Description | Type | Default | Release Added | Notes |
+| :--- | ---: | ---: | ---: | ---: | ---: |
+| contrib_enable_spot_nodes | Enable spot nodes | bool | false | 10.3.0 | |