feat: add markdown preview for citation

[shibbas]

Purpose

Previews the Markdown content of a citation in the thought process tabs.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[X] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

• Select a default question

• Submit

• Click a citation

What to Check

Verify that the following are valid

• Thought process window is opened
• Citation tab is selected
• Citation markdown is rendered

Other Information

[shibbas]

Addresses #73