docs: Add "Next Steps" section to installation guides for Linux and Mac (#42)

Signed-off-by: Pete Cheslock <petecheslock@gmail.com>

Author: petecheslock

docs/getting-started/linux_amd.md

@@ -149,4 +149,10 @@ you can save the completion script and source it from `~/.bashrc`:
 
 ```sh
 _ILAB_COMPLETE=fish_source ilab > ~/.config/fish/completions/ilab.fish
-```
+```
+
+## Next Steps
+
+Now that you have InstructLab installed, the next step is to initialize your environment.
+
+[Initialize InstructLab](../getting-started/initilize_ilab.md){: .md-button .md-button--primary }

docs/getting-started/linux_nvidia.md

@@ -143,3 +143,9 @@ you can save the completion script and source it from `~/.bashrc`:
 ```sh
 _ILAB_COMPLETE=fish_source ilab > ~/.config/fish/completions/ilab.fish
 ```
+
+## Next Steps
+
+Now that you have InstructLab installed, the next step is to initialize your environment.
+
+[Initialize InstructLab](../getting-started/initilize_ilab.md){: .md-button .md-button--primary }

docs/getting-started/mac_metal.md

@@ -141,4 +141,10 @@ you can save the completion script and source it from `~/.bashrc`:
 
 ```sh
 _ILAB_COMPLETE=fish_source ilab > ~/.config/fish/completions/ilab.fish
-```
+```
+
+## Next Steps
+
+Now that you have InstructLab installed, the next step is to initialize your environment.
+
+[Initialize InstructLab](../getting-started/initilize_ilab.md){: .md-button .md-button--primary }