v0.0.3 re-release with io.github.com

v0.0.3 re-release with io.github.com groupId, to follow https://central.sonatype.org/changelog/#2021-04-01-comgithub-is-not-supported-anymore-as-a-valid-coordinate

v0.0.3 FtlDoc

v0.0.3 Compiled with Java 8

• Updated Freemaker to 2.3.31
• Added to @param an optional entry for type.
• Added support of JsDoc @param style annotations
• Added some basic tests using JUnit 5 + Spock 2
• Added maven configuration parameters to change :
  • Freemarker compatibility version
  • Title
  • Embed readme/welcome text
• Strong refactor of templates to adopt a modern style, without using framesets (see https://zardoz89.github.io/ftldoc/examples/simple_test/index.html )