Added SQL under DBMS under Docs

[abckhush]

Related Issue

None
Fix: #785

Description

SQL documentation has been added under DBMS section under Docs-Tutorials

Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Other (specify): _______________

Screenshots / Videos (if applicable)

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• I have performed a self-review of my code.
• I have read and followed the Contribution Guidelines.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots, and videos after making the changes.
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[deepsource-io]

Here's the code health analysis summary for commits 6bdb820..4453901. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[ajay-dhangar]

Done