* [BAEL-17489] Adding README descriptions to the following modules:
spring-boot-custom-starter
spring-boot-disable-console-logging
spring-boot-gradle
spring-boot-jasypt
spring-boot-keycloak
spring-boot-kotlin
spring-boot-logging-log4j2
spring-boot-management
spring-boot-mvc
spring-boot-mvc-birt
* Change description of management module and add prev/next links as per new template.
* Thin jar option for Spring Boot bootstrap and gradle projects.
* .gitignore for spring-boot-gradle project.
* Maven and Gradle 'thin' Boot builds (optional)
* Rename 'wrapper' to 'thin' and shorten some lines of code to fit the article.
