Standardize list formatting in README Skills section

[Copilot]

The Skills & Tools section used inline centered dot separators (·) for list items while all other sections used individual bullet points.

Changes

Split compound list items in README.md:

Web Design

-- UI/UX Design · Responsive Design · Prototyping · Brand Identity
+- UI/UX Design
+- Responsive Design
+- Prototyping
+- Brand Identity

Data Analytics

-- Business Intelligence · Data Visualization · Customer Insights · Performance Metrics
+- Business Intelligence
+- Data Visualization
+- Customer Insights
+- Performance Metrics

Formatting now matches About Me, What I'm Learning, Let's Collaborate, and Beyond Code sections.

Original prompt

Pull Request: https://github.com/eternograf/Eternograf/pull/1/files

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