DISCOVERY: Show visually article's tags

[azinit]

• ONLY IF NEEDED
• Not forget to resolve collisions with DISCOVERY: Add diataxis-type badges on articles #299 and DISCOVERY: Add difficulty badges on articles #295
• Feel free to use "built-in" docusaurus tags-styles

  <span class="badge badge--primary">Primary text</span>
  <span class="badge badge--secondary">Secondary text</span>
  <span class="badge badge--success">Success text</span>
  <span class="badge badge--danger">Danger text</span>
  <span class="badge badge--warning">Warning text</span>
  <span class="badge badge--info">Info text</span>
  <span class="badge badge--light">Light text</span>
  <span class="badge badge--dark">Dark text</span>

[azinit]

Already implemented