Decide on search strategy

### Summary
A functional search function is implemented in `list_public_experiences` in `views.py`
At the moment the search returns results only for exact matches in the story, difference, or title text.
So for the story that begins:
> My family recently got a new TV.

Searching for **family** or **TV** or **recently got** will return the story. As will searching for **got a new**.

However searching for **family TV** will not return any results.

This is perhaps unexpected behaviour given how most search engines return results

### Deadline
July 2023

### What needs to be done?
Refactor the function - possible suggestion to assume the search function is a space separated list and iterate. Also deal with phrases within quotation marks as exact matches

- [ ] Decide on a couple of key features (suggested above)
- [ ] Update function
- [ ] Apply function to other areas of code that use search (perhaps move to helper function)

I think this runs a risk of being over-engineered so I think perhaps ensuring that all the examples given in the summary would return the story is a sensible stopping point.
### Who can help?

*
*

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### Updates