Move configuration for TypeScript, configuration for NYC, and tests to
inside of the server/ directory.

Hoist shared TS ESLint config options to project root

Import from react / use react types to make typescript happy.

Add prefresh config: Webpack 5 support for prefresh has not yet landed,
but set up the configuration anyways.

Split lint script into separate server and client lint jobs, use `types`
option in tsconfig to restrict global type loading, explicitly define
`process.env` in client.

Roll back to Webpack 4 because Storybook does not support Webpack 5 for
the near future (see
storybookjs/storybook#11326 (comment)).

Use @storybook/react (which includes React as a dependency) instead of
Preact because the Storybook build breaks when using theme-ui (most
likely because of the bundled React dependency).

Factor out Babel config to babel.config.js so Jest can also use it. Also
set up globals handled by ProvidePlugin in Jest.

@types/history@2 added as a dependency to force yarn to not hoist
@types/history@^4.7 required by @types/reach__router, which is required
by storybook somewhere. This ensures TypeScript resolves 'history' as
@types/history@^4.7 instead of history@^5, which would otherwise happen
if yarn hoisted @types/history.

Jest is running with TypeScript Babel preset to transpile server code
and run against the TS sources; as a result, the leaderboard worker
needed to be mocked out, since worker_process bypasses the transpiler.

Always run codecov collect step if the tests ran (regardless of success
/ failure), and run client tests too.

Use project references for server (source and test), and also pull
shared config options up where possible.

Split config loading steps into individual exported functions; this
allows for fine-grained control over config in tests by mocking the
`load` module. Tests are set up to load config from its own conf.d, but
inherit critical environment settings like database connections from the
current (actual) config.

Use preact-render-to-string since preact-render-to-json does not
actually render components in Preact X. Also add stories for navbar
components.

Make client Jest config explicitly specifiy CWD for babel, so it can be
run from any directory. Set top-level `test` script to use `--projects`,
and also add a pre-commit hook to run Jest in only-changed mode.

Use mock factory to ensure config mocking works in all environments;
this fixes crashes with the full app startup integration test (and
therefore also fixes CI tests). Also add `--forceExit` to lint-staged
command.

Add handler for `invalid` event, clear user-agent styles on invalid, and
make cursor when mousing over empty TextInput more consistent.

Also fix label positioning when TextInput has content - this now uses an
extra span for positioning.

This ensures that missing snapshots fail the pre-commit hook

Update storybook to release 6.0.2, and use new Args CSF in stories. Also
set default values in component function declarations instead of using
`??` for defaults.

Fix license and author information

Move all sources to exist as packages linked through lerna / yarn
workspaces.

Most lint / test dependencies are kept in the top-level package.json.

Code changes:
- server now recursively searches its parent directories for a conf.d if
  the path is not explicitly provided

Running a build is now a prerequisite for the `dev` script (instead of
being invoked directly).

Update Node version, use Alpine for prepare step, and pretty-print the
final package.json.

This change should ensure that the Docker build isn't broken by PRs.

Copy Babel deps used by Jest to root, and move webpack loaders to
client.

Load Storybook Babel config from main client babel.config.js, and move
react-refresh plugin to be inline inside the webpack config (since that
is the only place where it is used).

This fixes Storybook failing to load stories.

Also enable bugfixes mode in @babel/preset-env for smaller bundle sizes.

refactor: use lerna / yarn workspaces

@types/history must be kept at an outdated / incompatible version to
prevent hoisting of @types/reach__router#@types/history to root; fix
this, and add a typechecking job to CI.

feat(client): add Card component

This ensures pressing Enter on the input will work as intended.

Add more space in card, and make CTF title a prop. Also adjust theme to
use base preset.

Use Box with margin top instead of abusing grid for positioning recover
link, and disable submit button when no code has been entered.

Add hover / click styles to links, set cursor to pointer on buttons.

When showError is true, always display the div for the error message,
even if the message is currently empty, to minimize layout shift when an
error appears.

Fix an un-updated snapshot from previous commit, and add snapshot tests
explicitly to test in pre-commit hook. This may cause a duplicate test
run of snapshot tests, but it seems the majority of the time, the
snapshot test does *not* run when it should.

 into refactor/ts-leaderboard

 into refactor/ts-leaderboard

Add login card

Pull out common Redis client options into object, use const enum for
Opaque tag type, and set up Jest / Babel to support const enums. Also
add the Babel plugin to client build.

refactor(server): refactor all cache and leaderboard to use TS