Add BookmarkFilled icon

[feute]

Hello, I wanted to contribute by adding a simple "filled" variant for the bookmark icon. All I did was to copy the Figma file to be able to edit it, then I mimicked the filled variant of the sewing pin related to its normal "unfilled" state, i.e., duplicating the icon shape and using a fill instead of a stroke.

I'd like to get some feedback to see if this is the right way to do it, and if I can do more, since all I did (or could do) was to add the SVG, the React component, and added it to the website; I guess there's more I'm missing, since there's an IconJar, a zip, and a Sketch file, but I couldn't figure out how to update them accordingly (and I don't even have Sketch), so I guess it's not up to me.

If this is this easy I'd like to discuss and contribute to more icon variants if this goes through at the end.

This closes #95

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PR checklist:

• [ ] Figma: icon shapes use “Scale” constraint
• [ ] Figma: icon components are sorted Z-A in the file
• [ ] Figma: icon components are built with a single union or compound shape when possible
• [ ] Figma: library changes are published
• [X] SVG: icons render correctly in a browser
• [X] SVG: icons are exported with width="15" height="15" viewBox="0 0 15 15"
• [X] SVG: no icons are exported with stroke
• [X] SVG: no icons are exported with clip-path
• [X] SVG: no icons exceed 5 KB
• [X] Website is up to date
• [ ] Sketch file is up to date
• [ ] IconJar file is up to date
  • [ ] Version in the IconJar library description is correct

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[vladmoroz]

Hey, thanks for the contribution. Sorry for the delay, I'll have a chance to check it out later this week.