docs: Update docs with all manager features and improve consistency

docs/2_3_managing_patches.md

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+# 🧩 Managing patches
+
+Learn how to add new, manage existing or remove patches.
+
+## ✅ Steps to manage patches
+
+1. Navigate to the `Patches` tab at the top navigation bar
+2. Tap on the `+` button in the bottom right corner
+3. Chose one of the options to add new patches[^1]:
+   - **Enter URL**: Add patches from a remote location
+   - **Select from storage**: Add patches from your local storage
+4. Select one of the patches from the list to manage or remove it
+
+[^1]: The selected file must be a JSON using the [ReVanced API](https://github.com/revanced/revanced-api) format
+(Example: `https://api.revanced.app/v4/patches`).
+
+## ⏭️ What's next
+
+The next page will explain how to update ReVanced Manager.
+
+Continue: [🔄 Updating ReVanced Manager](2_4_updating.md)
+