[Accessibility Screen Reader Review] Serious - Data Science Projects Issues

Description of problem:

A11Y serious issues found for the Data Science Projects as reported in the [report|https://docs.google.com/spreadsheets/u/1/d/1yiSedjyrcFB_O41gIlzOIzJfXZrHUfyW2VNVL4XiZas/edit?usp=sharing]

1. The screen reader doesn't read question mark 

2. The screen reader doesn't read question marks (3 instances of this on this page)

3. The screen reader doesn't read exclamation marks (2 instances of this on this page)

4. The screen reader doesn't read question mark 

5. The screen reader doesn't read question marks (13 instances of this on this page)

6. It is unclear to whom the "start server" buttons/links belong  

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

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Reproducibility (Always/Intermittent/Only Once):

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