FEAT #13827 TIME 2:30 add select indexing component + fix reindexing action

src/frontend/app/actions/actions.service.ts

src/frontend/app/app.module.ts

src/frontend/app/indexation/indexation.component.html

src/frontend/app/indexation/indexation.component.scss

src/frontend/app/indexation/indexation.component.ts

...elect-indexing-model/select-indexing-model.component.html

...elect-indexing-model/select-indexing-model.component.scss

.../select-indexing-model/select-indexing-model.component.ts

src/frontend/css/maarch-material.css

src/frontend/css/maarch-material.scss