Consolidate font sizes and line heights

Add `make sure`

Bump mocha from 7.2.0 to 8.0.1

Bump puppeteer from 3.3.0 to 4.0.0

Bump karma from 5.0.9 to 5.1.0

Bump eslint-plugin-mocha from 5.3.0 to 7.0.1

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.691.0 to 2.696.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.691.0...v2.696.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 17.11.0 to 18.0.0.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](https://github.com/octokit/rest.js/compare/v17.11.0...v18.0.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [mocha](https://github.com/mochajs/mocha) from 7.2.0 to 8.0.1.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mochajs/mocha/compare/v7.2.0...v8.0.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [puppeteer](https://github.com/puppeteer/puppeteer) from 3.3.0 to 4.0.0.
- [Release notes](https://github.com/puppeteer/puppeteer/releases)
- [Commits](https://github.com/puppeteer/puppeteer/compare/v3.3.0...v4.0.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [karma](https://github.com/karma-runner/karma) from 5.0.9 to 5.1.0.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v5.0.9...v5.1.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [eslint-plugin-mocha](https://github.com/lo1tuma/eslint-plugin-mocha) from 5.3.0 to 7.0.1.
- [Release notes](https://github.com/lo1tuma/eslint-plugin-mocha/releases)
- [Changelog](https://github.com/lo1tuma/eslint-plugin-mocha/blob/master/CHANGELOG.md)
- [Commits](https://github.com/lo1tuma/eslint-plugin-mocha/compare/5.3.0...7.0.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fixes https://github.com/hypothesis/client/issues/2177

Add utility class for primary-styled button

Needed by the “Experimental New Note Button”

Fix rendering issue when the org logo is missing by omitting the <img> entirely 

There was a `font-size` rule legacy from (presumably) when the logo was
via an icon font.

Quotes were 1 pixel smaller than annotation body text. Now they are not.

The value previously set for `$base-font-size` in `variables` was
`16px`, which is a noble idea, but the only place it’s used is in
`sidebar`, where it was immediately overridden to `12px`. So, in reality,
it’s 12px.

Refactor the way that `Button` components are styled

Handling any deviation from default styling of `Button` components
has been painful, and these changes make it an all or nothing affair:
the `Button` component will apply default styling only in the absence
of a `className` prop. When a `className` prop is present, that will
supersede any component default styling.

These changes make button SCSS mixins clearer and easier to reuse and
extend.

`usePrimaryStyle`, `useCompactStyle`, `useInputStyle` props removed
from `Button` in preference of mixins to reduce `Button` complexity and
confusion over CSS precedence.

Components that use `Button`, and their styles, have been updated here
as needed.

Bump sass from 1.26.7 to 1.26.8

Bump @sentry/browser from 5.15.5 to 5.17.0

Bump postcss from 7.0.31 to 7.0.32

Bump puppeteer from 3.2.0 to 3.3.0

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.31 to 7.0.32.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/7.0.31...7.0.32)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.687.0 to 2.691.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.687.0...v2.691.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 17.9.2 to 17.11.0.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](https://github.com/octokit/rest.js/compare/v17.9.2...v17.11.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [sass](https://github.com/sass/dart-sass) from 1.26.7 to 1.26.8.
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/dart-sass/compare/1.26.7...1.26.8)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [@sentry/browser](https://github.com/getsentry/sentry-javascript) from 5.15.5 to 5.17.0.
- [Release notes](https://github.com/getsentry/sentry-javascript/releases)
- [Changelog](https://github.com/getsentry/sentry-javascript/blob/master/CHANGELOG.md)
- [Commits](https://github.com/getsentry/sentry-javascript/compare/5.15.5...5.17.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>