✨ Add option to control line width

[joao-m-santos]

Relates to #95

📝 Description

Added an option lineWidth to customize line width
Added that to a new interface LineChartOptions
lume-line-group now also scales its lume-points to the lines' width

💥 Is this a breaking change (Yes/No):

• No
• Yes (please describe the impact and migration path for existing Lume users)

📝 Additional Information

Removed some unused SASS variables

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• Read the Contributing Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

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