brew: make a common page for macOS, Linux and Windows

pages/common/brew.md

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+# brew
+
+> Package manager for macOS and Linux.
+> More information: <https://brew.sh>.
+
+- Install the latest stable version of a formula or cask (use `--devel` for development versions):
+
+`brew install {{formula}}`
+
+- List all installed formulae and casks:
+
+`brew list`
+
+- Upgrade an installed formula or cask (if none is given, all installed formulae/casks are upgraded):
+
+`brew upgrade {{formula}}`
+
+- Fetch the newest version of Homebrew and of all formulae and casks from the Homebrew source repository:
+
+`brew update`
+
+- Show formulae and casks that have a more recent version available:
+
+`brew outdated`
+
+- Search for available formulae (i.e. packages) and casks (i.e. native packages):
+
+`brew search {{text}}`
+
+- Display information about a formula or a cask (version, installation path, dependencies, etc.):
+
+`brew info {{formula}}`
+
+- Check the local Homebrew installation for potential problems:
+
+`brew doctor`