Add alt text and introduction audio

[Zelalem1222]

In this pull request, I added alt text and other accessibilities

• Page Title - no issue found
• Image text alternatives - include alt texts
• Text heading - no issue found
• Color contrast - no issue found
• Resize - Text-only zoom is not working because I limit the height of the sections. but Page zoom is working fine.
• Interaction - no issue found
• Moving Content - no issue found
• Multimedia - no issue found
• The basic structure of the page - no issue found

[prolajumokeoni]

In this pull request, I added alt text and other accessibilities

1. Page Title - no issue found
2. Image text alternatives - included
3. Text heading - no issue found
4. Color contrast - no issue found
5. Resize - work fine

Your report should include: List all points that you have checked, i.e:

• Page titles
• Image text alternatives** ()
• Text headings
• Color contrast
• Resize
• Interaction
• Moving content
• Multimedia
• The basic structure of the page
• [ ] Kindly update your report in your pull request

Each point on the list needs to include the result of your evaluation:

If everything was ok, make a statement about that (e.g. "Page titles - no issues found").

• [ ] If issues were found, ypu should link to the corresponding line of code in the Pull Request changes