Replaced several HTTP Basic images with code blocks

- Show console commands as fenced code blocks
- Show PHP configuration as fenced code blocks
- Show HTTP requests as fenced code blocks
Use fenced code blocks for console, HTTP

- Modified to use fenced code blocks for console tool demonstrations, as well as
  HTTP examples
Updated custom ACL recipe to use fenced code blocks

- used for HTTP request/response demonstrations.
Merge branch 'hotfix/auth-code-samples'

Updates the authentication/authorization samples to use fenced code blocks for:

- Displaying PHP configuration
- Displaying HTTP requests and responses
- Displaying console commands