Replace header markup and remove variables from quickstart README headers

Change header style format from using '===' and '---' markdown syntax to using '#' syntax. This allows generation of quickstart name in the document titles for the generated README.html files. It also makes it easer to grep for headers.

We also need to remove variables from titles. When the README files were updated to replace product names with variables, it broke some links to headers.

For JBoss EAP quickstarts:
`Start the ${product.name} Server` resolves to `Start the JBoss EAP Server` and needs this reference: See [Start the ${product.name} server](#start-the-jboss-eap-server)

For WildFly quickstarts:
`Start the ${product.name} Server` resolves to `Start the JBoss EAP Server` and needs this reference: See [Start the ${product.name} server](#start-the-wildfly-server)