wiki: add Carbon Design System icons (2673) + pictograms (1000)

- 2673 SVG icons from @carbon/icons v11.82.0 (~2.5 MB)
- 1000 SVG pictograms from Carbon Design System (~2.0 MB)
- Updated 00-overview.md with asset structure and category listing

All icons: 32x32, fill: currentColor, optimized SVG
All pictograms: 24x24, fill: currentColor, SVG

assets/icons/carbon/ibm-cloud-mass-data-migration.svg

@@ -0,0 +1,9 @@
+<!-- Generator: Adobe Illustrator 26.3.1, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
+<svg version="1.1" id="icon" x="0px" y="0px" width="32px" height="32px" viewBox="0 0 32 32" style="enable-background:new 0 0 32 32;" xml:space="preserve">
+<style type="text/css"> .st0{fill:none;}
+</style>
+<path d="M22,30H10c-1.1,0-2-0.9-2-2v-3h2v3h12v-3h2v3C24,29.1,23.1,30,22,30z"/>
+<polygon points="15,14.8 15,25 17,25 17,14.8 19.6,17.4 21,16 16,11 11,16 12.4,17.4 "/>
+<path d="M24.8,9.1C23.9,5,20.3,2,16,2S8.1,5,7.2,9.1C4.2,9.7,2,12.4,2,15.5C2,19.1,4.9,22,8.5,22H12v-2H8.5C6,20,4,18,4,15.5 c0-2.3,1.8-4.3,4.1-4.5L9,11l0.1-0.8C9.5,6.6,12.5,4,16,4c3.5,0,6.5,2.6,6.9,6.1L23,11l0.8,0.1c2.3,0.2,4.1,2.2,4.1,4.5 c0,2.5-2,4.5-4.5,4.5H20v2h3.5c3.6,0,6.5-2.9,6.5-6.5C30,12.4,27.8,9.7,24.8,9.1z"/>
+<rect id="_x3C_Transparent_Rectangle_x3E__232_" y="0" class="st0" width="32" height="32"/>
+</svg>