Call out warning on the installation page are intimidating

[magdmartin]

This issue follows the Heuristic Analysis done by asengupta on the forum

The call-out warning on https://openrefine.org/docs/manual/installing can make the process feel high stake or intimidating.

Possible Solution

• integrate call-out warnings with the text
• Use neutral language to not scare the user
• Use consistent pattern for warning
  • type of content that's body content vs warning
  • language templates
  • consistent styles (font size, weight, case, icon, color)