Add build number based on commit hash

Also updated the navigation bar to make links alive:

• Link to Gitlab repository
• Starting Help section with meaningful links...

Closes #42

ci/build/build_frontend.sh

 #!/bin/sh
 
 docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
-docker build -t "$CI_REGISTRY_IMAGE/frontend:${CI_COMMIT_REF_NAME}" frontend/
+docker build -t "$CI_REGISTRY_IMAGE/frontend:${CI_COMMIT_REF_NAME}" --build-arg VUE_APP_GIT_COMMIT=${CI_COMMIT_SHORT_SHA} frontend/
 docker tag "$CI_REGISTRY_IMAGE/frontend:${CI_COMMIT_REF_NAME}" "$CI_REGISTRY_IMAGE/frontend:latest"
 docker push "$CI_REGISTRY_IMAGE/frontend:${CI_COMMIT_REF_NAME}"