Do not include Twitter Bootstrap in quarkus-bom

[ge0ffrey]

The quarkus-bom should not enforce org.webjars:bootstrap:3.1.0, because it leads to a gradle build like this:

testRuntimeClasspath - Runtime classpath of source set 'test'.
+--- io.quarkus:quarkus-bom:1.8.2.Final
|    +--- io.quarkus:quarkus-hibernate-orm-panache:1.8.2.Final (c)
...
|    +--- org.webjars:bootstrap:3.1.0 (c)
...
+--- io.quarkus:quarkus-webjars-locator -> 1.8.2.Final
...
+--- org.webjars:bootstrap:4.3.1 -> 3.1.0 // <=================== Not good!
|    \--- org.webjars:jquery:1.9.0 -> 3.4.1
+--- org.webjars:jquery:3.4.1
...

which in turn leads to styling issues on the front end, which are hard to track down.

AFAIK, that twitter bootstrap webjar in quarkus-bom is only needed to test the quarkus-webjars-locator. It shouldn't trickle down to the quarkus users.

@Christopher-Chianelli ^^