[Ceylin] Add Discussion Posting into Web

[ceylingebes]

As we have decided in Lab 8 and also according to the feedback we got from customers, mentioned in PR #326, we need to create a new post type named as discussions for our web application. The related acceptance criteria and example usages are stated below:

"Users shall be able to just discuss on the forum without posting a question.

Acceptance Criteria:
A discussion section will be introduced where users can post open-ended topics without marking them as questions.
Example Usage:
User creates a new discussion thread about "The future of AI in education" and receives comments from other users."

You may split the issue to tasks if necessary

• Differentiate post types for discussions or questions in feed
• Differentiate post types for discussions or questions in question details page
• Add discussion and question tabs for post creation page

Deadline: 13.12.2024
Estimated effort: 2 hrs
Reviewer: @kristinatrajkovski , @halil-karabacak

[Mutti499]

I came here to help my friend Ceylin about backend. In my last commit added:

• Adding question type. Changing adding and editing functions according to that. Improving backend
• Change bookmark logic.
• Fixing feed post frontend a big time.
• Removing horrible check_bookmark function.

[ceylingebes]

Just for the update: I have completed the changes in the feed and post creation pages. You can check them in add-discussions branch. I am waiting for question details page since our friend Damla is making huge changes there.