feat(icon): add icon

doc/_icon/alf.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="94" height="20" role="img" aria-label="license: AFL3.0"><title>license: AFL3.0</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="94" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="47" height="20" fill="#555"/><rect x="47" width="47" height="20" fill="#97ca00"/><rect width="94" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="245" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="370">license</text><text x="245" y="140" transform="scale(.1)" fill="#fff" textLength="370">license</text><text aria-hidden="true" x="695" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="370">AFL3.0</text><text x="695" y="140" transform="scale(.1)" fill="#fff" textLength="370">AFL3.0</text></g></svg>

doc/_icon/cache.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="88" height="20" role="img" aria-label="Wheat: Cache"><title>Wheat: Cache</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="88" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="45" height="20" fill="#555"/><rect x="45" width="43" height="20" fill="#a4a61d"/><rect width="88" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="235" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="350">Wheat</text><text x="235" y="140" transform="scale(.1)" fill="#fff" textLength="350">Wheat</text><text aria-hidden="true" x="655" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="330">Cache</text><text x="655" y="140" transform="scale(.1)" fill="#fff" textLength="330">Cache</text></g></svg>

doc/_icon/version.svg

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+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="86" height="20" role="img" aria-label="version: v1.1"><title>version: v1.1</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="86" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="51" height="20" fill="#555"/><rect x="51" width="35" height="20" fill="#007ec6"/><rect width="86" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="265" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="410">version</text><text x="265" y="140" transform="scale(.1)" fill="#fff" textLength="410">version</text><text aria-hidden="true" x="675" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="250">v1.1</text><text x="675" y="140" transform="scale(.1)" fill="#fff" textLength="250">v1.1</text></g></svg>