Remove <strong> tags from the following chapter titles

[Shelton]

• [x] Get Started
• [x] Bootstrapping Cog
• [x] Configuring Password Resets
• [x] Command Environment Variables
• [x] Reference
• [x] Appendices
• [x] Colophon

[Shelton]

@KnoWrangler and I fixed up these headers with the most current release.