add attributes for Fill, Stroke, Width & Height

[OmarMcAdam]

❓ Type of change 📖 Documentation (updates to the documentation or readme) 👌 Enhancement (improving an existing functionality like performance) ✨ New feature (a non-breaking change that adds functionality) ⚠️ Breaking change (fix or feature that would cause existing functionality to change) 📚 Description

📝 Checklist I have updated the documentation accordingly.

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What did I do?

1. Add stroke overwrite attribute to enable changing SVG stroke colors
2. Reverse logic on fill attribute - you must specify fill to use the SVG's original fill color - Issue: https://github.com/gitFoxCode/nuxt-icons/issues/4#issue-1271564962
3. Add width attribute - manually specify width of SVG
4. Add height attribute - manually specify height of SVG
5. Set SVG aspect-ratio to 1:1
6. Switched icon html to enable dynamic centering of icon on both axis
7. Updated Documentation to re-shuffle order, add info about sub-folders and provide instructions/examples for attributes

BREAKING CHANGES Due to the inversion of the fill logic, this may cause some visual changes to icons. - Issue: https://github.com/gitFoxCode/nuxt-icons/issues/4#issue-1271564962 Previous Behavior: if you do not set the fill attribute, the SVG will use it's built in colors New Behavior: You must explicitly tell the SVG to use it's built in colors To Fix: remove fill from icons that already have the attribute, and add fill to icons that dont.

+Note: May require some additional CSS wizardry for edge cases*