[ux] Can't open .md file OOTB in IntelliJ 2020.2.3 inside che.openshift.io

[nickboldt]

Describe the bug

Seems I can't open a .md file in Intellij 2020.2.3 inside hosted che.

Che version

• other: 7.20.1

Steps to reproduce

1. Open https://che.openshift.io/dashboard/
2. Go to Workspaces tab, then click Add Workspace -> https://che.openshift.io/dashboard/#/getstarted?tab=customWorkspace
3. in the URL of devfile field, enter https://raw.githubusercontent.com/che-incubator/jetbrains-editor-images/master/devfiles/workspace.yaml and click Load devfile
4. scroll down and click Create & Open

5. Watch the console messages. Confirm acceptance of license. Click Get from Version Control and open a project like https://github.com/redhat-developer/codeready-workspaces/ -- note that you have to type it in my hand (see [ux] copy and paste does not work in IntelliJ editor, and URL field can't figure out that github.com = https://github.com #18328 )

6. Open the README.md file in the above repo:

7. Click the 'Follow the instructions' link:

Should we install chrome or firefox inside the container?

[mmorhun]

@vzhukovs it looks like a bug, not a question. Why do you think that this issue is a question?

[vzhukovs]

@mmorhun because it is the question around missed installed libraries needed to support markdown plugin, which is actually internal thing according to classification of issue type. Created related issue: #18336 with the following PR che-incubator/jetbrains-editor-images#19