Implemented contrast on snackbar

src/Components/Alert.js

src/Components/ButtonGuardarColecao.js

src/Components/CollectionCardFunction.js

src/Components/CollectionCommentSection.js

src/Components/CollectionDowloadButton.js

src/Components/ContactButtons/FollowButton.js

src/Components/ContactCardOptions.js

src/Components/ContactForm.js

src/Components/Firulas.js

src/Components/Header.js

src/Components/ItemCardAction.js

src/Components/LoginModal.js

src/Components/ModalAvaliarRecurso.js

src/Components/ModalExcluirColecao.js

src/Components/ReportModal.js

src/Components/ResourceCardFunction.js

src/Components/ResourceCardOptions.js

src/Components/ResourceList.js

src/Components/ResourcePageComponents/CommentsArea.js

src/Components/ResourcePageComponents/Footer.js