"kb style" docs: decouple URLs from structure

Signed-off-by: Solomon Hykes <solomon@dagger.io>

docs/1001-install.md

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+---
+sidebar_position: 2
+slug: /1001/install/
+---
+
+# Install Dagger
+
+## Option 1: Use Homebrew (Mac OS only)
+
+From your Mac OS terminal, run the following command:
+
+```shell
+brew install dagger/tap/dagger
+```
+
+If dagger is already installed, you can upgrade it using this command:
+
+```shell
+brew update; brew upgrade dagger
+```
+
+## Option 2: Run a shell script
+
+From a terminal, run the following command:
+
+```shell
+curl -sfL https://releases.dagger.io/dagger/install.sh | sh
+```
+
+You now have the dagger binary in the local directory under `./bin/dagger`.
+
+You can then install it globally on your system:
+
+```shell
+sudo mv ./bin/dagger /usr/local/bin
+```
+
+## Option 2 (Windows): Run a shell script
+
+From a terminal, run the following command:
+
+```shell
+curl https://releases.dagger.io/dagger/install.ps1 -OutFile install.ps1 ; ./install.ps1; rm install.ps1
+```
+
+We try to move the dagger binary under `C:\Windows\System32` but
+in case use missing the necessary permission we'll save everything under `<your home folder>/dagger`
+
+## Option 3: Download a binary release
+
+Open your web browser to [the latest release](https://github.com/dagger/dagger/releases/latest).
+
+From the **assets** section, download the archive corresponding to your OS and Arch.
+
+## Option 4: Install from source
+
+You will need [Go](https://golang.org) version 1.16 or later.
+
+1\. Clone the dagger repository
+
+```shell
+git clone https://github.com/dagger/dagger.git
+```
+
+2\. Build the `dagger` binary.
+
+```shell
+cd dagger; make
+```
+
+3\. Copy the `dagger` tool to a location listed in your `$PATH`. For example, to copy it to `/usr/local/bin`:
+
+```shell
+cp ./cmd/dagger/dagger /usr/local/bin
+```