818 dashboard modify input data section for multiple examples

[laurasootes]

This PR a specifications for each example in the dashboard in the left menu (fixes #818).
Additionally, upon example selection, text will be shown explaining what the example is (adds to #816 and #819)

Please check if the explanatory text is sufficient.

[SarahAlidoost]

@laurasootes thanks for adding clear explanations for each example 🥇 . Some text used in test_dashboard.py should be changed accordingly, for example this one.

Also, I noticed a title is set for each page as st.title('Image explanation') or st.title('Time series explanation'), .... Can we make them more informative? 🤔

I fixed some line too long errors, but let's check if there are other linter errors. Can you please run ruff check on the changed files?

[laurasootes]

hi @SarahAlidoost, thanks for your review. I updated the dashboard tests accordingly and checked the line lengths, after your fixes they are all good now.

I agree with your comment about the page title. I have added it to issue #816 where in which all tetx-related things will be updated

[SarahAlidoost]

@laurasootes thanks for addressing the comments. Changes look good 👍 Before merging, can you please change the base branch of this pull request from 817-dashboard-move-menu to main. Because #830 is already merged. Also, only after changing the base to main, github action will run automatically on this pull request.