feat(docs): Covalent Text/Markdown Editor Demo

[jeremysmartt]

Description

Added demo for Covalent Text/Markdown Editor into Covalent Docs

What's included?

• new file: src/app/components/components/text-editor/text-editor.component.html
• new file: src/app/components/components/text-editor/text-editor.component.scss
• new file: src/app/components/components/text-editor/text-editor.component.ts
• modified: package.json
• modified: src/app/components/components/components.component.ts
• modified: src/app/components/components/components.module.ts
• modified: src/app/components/components/components.routes.ts
• modified: src/app/components/components/overview/overview.component.ts
• modified: src/app/components/toolbar/toolbar.component.ts

Test Steps

• checkout branch
• rm -rf node_modules
• npm i
• ng serve
• go to http://localhost:4200/#/components
• Click on Text/Markdown Editor under optional components
• Try out editor and see output

General Tests for Every PR

• ng serve --aot still works.
• npm run lint passes.
• npm test passes and code coverage is not lower.
• npm run build still works.

Screenshots or link to CodePen/Plunker/JSfiddle

[kyleledbetter]

Pushed some updates to the demo in the docs: