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-pictograms/ibm--elm-gcm.svg

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Generator: Adobe Illustrator 29.1.0, SVG Export Plug-In . SVG Version: 9.03 Build 55587)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 32 32" style="enable-background:new 0 0 32 32;" xml:space="preserve">
+<path id="ibm--elm-gcm_00000038400960806097615690000006942009842263958147_" d="M17,31.36c-0.059,0-0.117-0.015-0.171-0.043l-13-7
+	l0.342-0.635L17,30.591l12.64-6.806V8.215L17,1.409L4.36,8.215V12H3.64V8c0-0.132,0.073-0.254,0.189-0.317l13-7
+	c0.107-0.058,0.234-0.058,0.342,0l13,7C30.287,7.746,30.36,7.868,30.36,8v16c0,0.133-0.073,0.254-0.189,0.317l-13,7
+	C17.117,31.346,17.059,31.36,17,31.36z M21.509,16l-5.254-5.254l-0.509,0.509l4.385,4.386H2v0.72h18.131l-4.385,4.385l0.509,0.51
+	L21.509,16z"/>
+<rect id="_Transparent_Rectangle" style="fill:none;" width="32" height="32"/>
+</svg>