Update to Angular 15

.browserslistrc

.eslintrc.json

.gitignore

.gitlab-ci.yml

.gitpod.yml

README.md

angular.json

e2e/tsconfig.json

package-lock.json

package.json

src/app/app.component.ts

src/app/app.module.ts

src/app/gitlab-ci/gitlab-ci.component.ts

src/app/kicker.ts

src/app/options-box/options-box.component.spec.ts

src/app/options-box/options-box.component.ts

src/app/stepbar/stepbar.component.ts

src/app/templates-section/templates-section.component.ts

src/assets/kicker-aggregated.json

src/test.ts