Update OSX Installation for Sonoma (#149)

* Update OSX Installation for Sonoma

Fix flameshot-org/flameshot#3572

Content comes from https://github.com/flameshot-org/flameshot?tab=readme-ov-file#macos

* Prettier MacOS installation

Fix comment #149 (comment)

content/docs/installation/installation-osx.md

@@ -2,7 +2,7 @@
 title = "Install on macOS"
 description = "Flameshot is a powerful yet simple to use screenshot software."
 date = 2021-05-01T08:00:00+00:00
-updated = 2021-05-01T08:00:00+00:00
+updated = 2024-05-30T08:00:00+00:00
 draft = false
 weight = 2
 sort_by = "weight"
@@ -20,6 +20,13 @@ You can install Flameshot on [macOS](https://en.wikipedia.org/wiki/MacOS) using
 
 - [MacPorts](https://ports.macports.org/port/flameshot/summary): `sudo port selfupdate && sudo port install flameshot`
 - [Homebrew](https://formulae.brew.sh/cask/flameshot): `brew install --cask flameshot`
+    > Note that because of macOS security features, you may not be able to open flameshot when installed using brew. If you see the message `“flameshot” cannot be opened because the developer cannot be verified.` you will need to follow the steps below:
+    >
+    > 1. Go to the Applications folder (Finder > Go > Applications, or Shift+Command+A)
+    > 2. Right-Click on `flameshot.app` and choose `Open` from the context menu
+    > 3. In the dialog click `Open`
+    >
+    > After following all those steps above, flameshot will open without problems in your Mac.
 - Download DMG file:
     1. Navigate to [the release page on Github](https://github.com/flameshot-org/flameshot/releases)
     2. From the assets of the latest stable release, download the latest DMG file