docs: Add BRAT installation instructions

docs/src/getting-started/installation-brat.md

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+# Installing plugin using Obsidian42-BRAT
+
+To install the `obsidian-confluence` plugin using [Obsidian42-BRAT](https://github.com/TfTHacker/obsidian42-brat#Quick-Guide-for-using-BRAT), follow these steps:
+
+## Adding a beta plugin
+
+1. Install **BRAT** from the Community Plugins in Obsidian.
+2. Get the link to the GitHub repository you want to test. The plugin developer can provide you with this link.
+   For the `obsidian-confluence` plugin, use this link: https://github.com/obsidian-confluence/obsidian-confluence
+3. Open the command palette and run the command `BRAT: Add a beta plugin for testing` 
+4. Using the link from step 2, copy that into the modal that opens up.
+5. Click on **Add Plugin** -- wait a few seconds and BRAT will tell you what is going on.
+6. After BRAT confirms the installation, in Settings go to the **Community plugins** tab.
+7. Refresh the list of plugins.
+8. Find the beta plugin you just installed (`obsidian-confluence`) and **Enable** it.
+
+## Updating beta plugins
+
+- Plugins can be updated using the command palette by running the command `Check for updates to all beta plugins and UPDATE`.
+- Optionally, beta plugins can be configured to auto-update when starting Obsidian. This feature can be enabled in the **Obsidian42- BRAT** tab in settings.

docs/src/getting-started/installation.md

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+
+# Alternative Installation
+Due to waiting for https://github.com/obsidianmd/obsidian-releases/pull/1867 to be merged.
+
+If you would like to use the plugin currently you will need to use [Alternative Installation](./installation-brat.md) instructions.
+
+# Installation
 1. Install the `confluence-integration` plugin from Obsidian's community plugins browser.
 2. Open the plugin settings and configure the following fields:
     - `Confluence Base URL`: The base URL of your Atlassian Confluence instance (e.g., `https://your-domain.atlassian.net`)