Update basic-usage to reflect new default to src layout

[adithyaappu]

Update Documentation

The change in default folder layout when a new project is created, was not updated in the Basic Usage section of documentation. This just updates the structure with the folder layout from the CLI reference.

Pull Request Check List

Resolves: #10135

• Added tests for changed code.
• Updated documentation for changed code.

Summary by Sourcery

Documentation:

• Update the basic usage documentation to reflect the new default src layout for new projects.

[sourcery-ai]

Reviewer's Guide by Sourcery

The documentation for basic usage was updated to reflect the new default project layout that includes a src directory. This change ensures that the documentation aligns with the current project structure generated by the CLI.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated the basic usage documentation to reflect the new default src layout for new projects.	Modified the directory structure in the basic usage example to include the src directory. Adjusted the path for the poetry_demo package to be within the src directory.	docs/basic-usage.md

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[sourcery-ai]

Hey @adithyaappu - I've reviewed your changes - here's some feedback:

Overall Comments:

• This change looks good, thanks for keeping the documentation up to date.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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