DOC: Add backend DB diagram on the docs page

[rahulharpal1603]

What's wrong with the existing documentation

We have a newly designed SQLite schema for our app. We need to embed it on our docs page: https://aossie-org.github.io/PictoPy/

Inside the backend section, make a section for DB Schema and that page should have an iframe:

<iframe width="560" height="315" src='https://dbdiagram.io/e/685704c4f039ec6d364647e1/68701a53f413ba350850acf9'> </iframe>

This iframe embeds our database design: https://dbdiagram.io/d/PictoPy-685704c4f039ec6d364647e1

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[ssz2605]

@rahulharpal1603 Can you please assign this issue to me?

[rohan-pandeyy]

Hi! I came across this issue and I’d love to help out too if possible.
@ssz2605 if you need any kind of assist with reviewing the changes, DB schema diagram, or help with the docs structure, feel free to reach out :)

[rahulharpal1603]

We go by FCFS, so @ssz2605 I am assigning.

[ssz2605]

@rahulharpal1603 thanks
@rohan-pandeyy sure, thanks