GitLab

Displaying an error message when the data fails to load along with a button to retry.

- Updated the type definition of gene symbol to String | null.
- Updated the example link text displayed in the genome browser bookmarks modal.
-  Updated the example link text displayed in the genome browser interstitial page

Updated the styling of the species tab in species selector when the species is not used.

- remove "View in genome browser" link from species selector page
- remove the "I am sidebar navigation" placeholder from species page
- update the favicon to match the new branding

use `/help-api` endpoint to proxy requests for the help & docs api service

- Update app topbar with the new logotype
- Remove the "e!" Ensembl logo
- Remove the video part of the HelpPopupButton
- Updated Home icon used in the topbar (the house image moved within the svg canvas)
- HeaderButtons component removed, because it's no longer used
- Update the icon for button linking to species page in HomepageAppLinks component

Fixed the issue with empty groups getting displayed in the Pseudogene stats section for Wheat.

Behaviour:
- Change 3-column popup layout to a 2-column layout
- When a video is selected, it occupies all available space of the left column
- The list of related articles and videos does not change once the first article is loaded
Code:
- Moved logic for fetching help articles and keeping track of article updates
   into a dedicated hook (useHelpArticles)
- Fixed a bug in the useApiService hook

Populate the species homepage sidebar by using sample data defined locally.

Update the AppBar species lozenge with the new design.

Clicking on the protein id in the transcript accordion will now open the protein view, automatically expands the selected protein and scroll it into the view.

- Added loaders to both ProteinList & ProteinListItemInfo
- Added the functionality to expand the first transcript by default in both transcript and protein view
-  Added the functionality to retain the scroll position when revisiting the transcript and protein view.
- Created useRestoreScrollPosition hook

Clicking on a popular species button for a committed species will open the species homepage instead of removing the species.

- fix checkbox styling in instant protein download component
- show the blue protein bar in the protein image
- show external references in EntityViewer sidebar

Hide the example links popup and display a link to genome browser when the environment is production.

- Created the ExpandableSection shared component
- Created the species page accordion
- Created the sample-data and the transformation function to populate the species homepage accordion including the example links
Co-authored-by: Andrey Azov <andrey@ebi.ac.uk>

Also, fixed extra width bug in EntityViewer transcripts view
that was caused by moving transcript-wrapping divs via `transform: translate`

* New selected species lozenge component with tests and stories

- New question icon
- Updated styles for QuestionButton
- Use the `useHover` hook in QuestionButton
- Update QuestionButton
- Replace the `dl` and `dd`-based markup for BrowserTrackConfig
  with a div-based one
- Remove default 40px width from SlideToggle 

Notable:
- Typescript v3 -> v4
- Storybook v5 -> v6
  - changed stories from `storiesOf` format to component story format
- Postcss-loader v3 -> v4
- D3 v5 -> v6