new demo

[mnida]

Resolves LOT-660
Resolves LOT-661

[linear]

LOT-660 Feature - Make New Demo + backtest

[linear]

LOT-661 Feature - Experiments page pt.1 Frontend

### Summary

(Describe in general, non-technical terms what is to be added - e.g. what is the business need being addressed?)

### Detailed Specification

(Describe the specific behavior that must be coded, relevant links, etc.)

### User Permissions (if applicable)

(Describe how user permissions interact with the new feature:
- who should be permitted to do what- which specific permission(s) should allow users to take each new action.

- any stakeholder-type settings that override or complement user-level permissions.

- expected behavior for non-permitted users [e.g. inability to act in UI, able to act but throw 500 error, 204 but with warning message for front end, silent failure, other?]) .

### Acceptance Criteria

(What constitutes a full resolution of this issue?)

### Notes

(Anything useful not captured above)