Feature/add samples and external product templates (#468)

* added samples and external product templates
some cleanup

* added sample texts and external product template files

* run prettier

* set java.version 11 -> 17

* set docker openjdk 11 -> 17

* replaced docker image openjdk:17 by amazoncorretto:17-alpine since openjdk17 was deprecated

server/Dockerfile

@@ -1,4 +1,4 @@
-FROM openjdk:17
+FROM amazoncorretto:17-alpine
 
 RUN adduser --system --group dipa
 USER dipa:dipa