Convert client components/pages to TypeScript

[dweemx]

This is an issue to track the conversion of the client components/pages to TypeScript. If you want to work on one of them, please provide your GitHub ID next to it.

Components (src/components/common) to convert to TypeScript:

• [ ] Annotation.jsx @MaybeJustJames
• [ ] AnnotationDropContainer.jsx @MaybeJustJames
• [ ] API.jsx
• [x] ClusteringAddPopup.jsx
• [x] ClusterOverlapsTable.jsx
• [ ] CollabAnnoGeneSearch.jsx
• [ ] ColloborativeAnnotation.jsx
• [x] Historgram.jsx @dweemx
• [x] OLSAutocomplete.jsx @dweemx
• [x] OptionsPopup
• [x] Uploader.jsx @MaybeJustJames
• [x] UploadModal.jsx @MaybeJustJames
• [ ] Viewer.jsx @MaybeJustJames
• [ ] ViewerDropContainer.jsx @MaybeJustJames
• [ ] ViewerToolbar.jsx
• [x] AppHeader.jsx
• [x] AppSidebar.jsx

All the refactored and TS-converted components should end up under: src/components.

Pages (src/components/pages) to convert to TypeScript:

• [x] About.jsx @MaybeJustJames
• [ ] Annotations.jsx
• [x] Compare.jsx @MaybeJustJames
• [ ] Dataset.jsx
• [x] Gene.jsx
• [x] Regulon.jsx @dweemx
• [ ] Tutorial.jsx
• [x] Welcome.jsx @MaybeJustJames

Miscellaneous:

• [x] src/components/App.jsx @MaybeJustJames