Fix episode overview markdown render

[Chaitanya-Shahare]

Changes

• used markdownIt to render the markdown in the episode's overview, as expected (and done in detail view of the episode)

Issues
Fixes #5679

Screenshots

Before

After

[Shadowghost]

Should this be PRed agains 10.9 since it's technically a bugfix?

[Chaitanya-Shahare]

Should this be PRed agains 10.9 since it's technically a bugfix?

I'm new to this repository, so please excuse me if this is obvious.

Do I have to make any changes to this PR?

[dmitrylyzo]

Do I have to make any changes to this PR?

Personally, I consider this PR as a bugfix because we use Markdown+HTML in the item details (#4393) but forgot to do the same in the episode list (this PR).
This PR also fixes possible XSS vulnerability (by sanitizing Overview).
Thus, it should target the release branch.

1. Rebase your branch in the interactive mode on release-10.9.z branch, leaving only related commits.
2. Verify that everything is correct (Currently there should be your 3 commits over the release branch. Actually, I would squash them in one commit). Force push your rebased branch to your repo. This PR will conflict, but don't worry.
3. Change the target branch from master to release-10.9.z using the Edit button next to the title of PR.

[Chaitanya-Shahare]

Do I have to make any changes to this PR?

Personally, I consider this PR as a bugfix because we use Markdown+HTML in the item details (#4393) but forgot to do the same in the episode list (this PR). This PR also fixes possible XSS vulnerability (by sanitizing Overview). Thus, it should target the release branch.

1. Rebase your branch in the interactive mode on release-10.9.z branch, leaving only related commits.
2. Verify that everything is correct (Currently there should be your 3 commits over the release branch. Actually, I would squash them in one commit). Force push your rebased branch to your repo. This PR will conflict, but don't worry.
3. Change the target branch from master to release-10.9.z using the Edit button next to the title of PR.

Thank you for the instructions, I'll do this.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.4% Duplication on New Code

See analysis details on SonarCloud