docs: restructure docs (#14421)

Closes #13434 
Supersedes #14182

---------

Co-authored-by: Ethan <39577870+ethanndickson@users.noreply.github.com>
Co-authored-by: Ethan Dickson <ethan@coder.com>
Co-authored-by: Ben Potter <ben@coder.com>
Co-authored-by: Stephen Kirby <58410745+stirby@users.noreply.github.com>
Co-authored-by: Stephen Kirby <me@skirby.dev>
Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Co-authored-by: Edward Angert <EdwardAngert@users.noreply.github.com>

examples/templates/aws-linux/README.md

@@ -11,8 +11,6 @@ tags: [vm, linux, aws, persistent-vm]
 
 Provision AWS EC2 VMs as [Coder workspaces](https://coder.com/docs/workspaces) with this example template.
 
-<!-- TODO: Add screenshot -->
-
 ## Prerequisites
 
 ### Authentication

examples/templates/nomad-docker/README.md

@@ -31,7 +31,7 @@ The CSI Host Volume plugin is used to mount host volumes into Nomad tasks. This
 
 2. Append the following stanza to your Nomad server configuration file and restart the nomad service.
 
-   ```hcl
+   ```tf
    plugin "docker" {
      config {
        allow_privileged = true
@@ -45,7 +45,7 @@ The CSI Host Volume plugin is used to mount host volumes into Nomad tasks. This
 
 3. Create a file `hostpath.nomad` with following content:
 
-   ```hcl
+   ```tf
    job "hostpath-csi-plugin" {
      datacenters = ["dc1"]
      type = "system"