docs: Reorganize introduction (#41387)

Release Notes:
- Remove Windows/Linux from Getting Started
- Consolidate download & system into new Installation page
- Move Remote Dev out of Windows and into Remote Development
- Add Uninstall page
- Add updates page
- Remove addl learning materials from intro

docs/src/command-line-interface.md

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+# Command-line Interface
+
+Zed has a CLI, on Linux this should come with the distribution's Zed package (binary name can vary from distribution to distribution, `zed` will be used later for brevity).
+For macOS, the CLI comes in the same package with the editor binary, and could be installed into the system with the `cli: install` Zed command which will create a symlink to the `/usr/local/bin/zed`.
+It can also be built from source out of the `cli` crate in this repository.
+
+Use `zed --help` to see the full list of capabilities.
+General highlights:
+
+- Opening another empty Zed window: `zed`
+
+- Opening a file or directory in Zed: `zed /path/to/entry` (use `-n` to open in the new window)
+
+- Reading from stdin: `ps axf | zed -`
+
+- Starting Zed with logs in the terminal: `zed --foreground`
+
+- Uninstalling Zed and all its related files: `zed --uninstall`