add thumbnail or DS9 view in page

src/App.css

src/components/FitsViewer.js

src/components/query/ASTRONVOResults.js

src/components/query/ApertifResults.js

src/components/query/HandlePreview.js

src/components/query/Preview.js

src/components/query/VOServiceResults.js

src/contexts/QueryContext.js

src/routes/Routes.js