docs: add upgrades page

Signed-off-by: Gabriele Bartolini <[email protected]>

Author: gbartolini

web/docs/resource-name-migration.md

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-sidebar_position: 41
+sidebar_position: 90
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 # Resource Name Migration Guide

web/docs/upgrades.mdx

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+---
+sidebar_position: 25
+---
+
+# Upgrades
+
+<!-- SPDX-License-Identifier: CC-BY-4.0 -->
+
+You can upgrade the plugin simply by installing the new version. Unless
+explicitly stated below or in the release notes, no special steps are required.
+
+## Upgrading to version 0.8.x from previous versions
+
+Version **0.8.0** introduces breaking changes to resource naming.
+To complete the upgrade successfully, follow the instructions in the
+["Resource Name Migration Guide"](resource-name-migration.md).