GitLab

* ENSWBSITES-958 and ENSWBSITES-957
* display gene source using gene metadata.name
* fix test by adding gene metadata
* check for gene metadata name should be for xref only
* Add margin top to source
* Remove unused regex for gene name formatting
* update test for genename formatting

Includes:
- Updated the Step component to use the label field instead of title, and to accept children
- Added a custom Help landing page (hiding the bottom section in production)
- Hiding the rest of the pages of the Help app in production
- Allow users to see the help landing page in production (links on the Home page and in the launchbar)
- Fixed the styles on the About page
- Hiding the Custom Download button in the launchbar in production

Also, add a ShowHide component, which consists of a label associated with a chevron

* Building the interstitials for the apps
* Show the interstitial on the EntityViewer page
* Fix tests
* Update styles for the BrowserInterstitialInstructions component
* Add nullability to a storage getter
* Add hide the in-app-search input field in production environment
* Reorder imports

- added a Node-based rendering server
- refactored build process (added dedicated script files for development and production build)
- refactored routing, so that it can be reused both on the client and on the server side
- added Page-type components for every app; currently they are the only components that run on the server and add the dynamic meta tags to the page
- updated redux code so that it doesn't try to access browser-specific apis during the startup
Co-authored-by: Kamal Dodiya <kamal@ebi.ac.uk>

Remove transcript symbols from EV transcript image and GB drawer

- display "None" if gene name is "novel transcript"
- remove the "Source" in square brackets

(ENSWBSITES-1037)

Major updates:
- React from v 16 to v 17
- react-spring from v 8 to v 9
- husky to 6.0.0
- faker (one major version bump)
- eslint-config-prettier

Temporarily added dependency on dotenv-webpack (latest version) to prevent Storybook from crashing.

This finally allows us to remove the dependency on Enzyme.

Also as part of this PR:

- Removed components
  - LaunchbarContainer (serves no purpose)
  - Account (not used)
  - SpeciesTab (superseded by SelectedSpecies component; not used anywhere)
- Removed tests for Launchbar
- Removed the launchbarExpanded and accountExpanded fields from redux and from components
- Changed the keyCode field on KeyboardEvent to event.key
   (typescript marks it as deprecated, whereas Browser support seems to be good these days).

* Add Bookmarks to Entity Viewer

Use browser history push rather than replace when switching between species in genome browser (#463)