wiki: checkin the Go-Release-Cycle image

The svg image was originally in
https://user-images.githubusercontent.com/24611692/228010841-fb299331-e7e3-4e64-85dc-66261ce22ea3.svg

Move to our vcs.

Also, delete release-cycle.png which didn't seem to be
referenced by any articles in wiki.

Change-Id: Id8aa621828966ab1484b4342002edb13f9de6aa1
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/558659
Commit-Queue: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
diff --git a/Go-Release-Cycle.md b/Go-Release-Cycle.md
index 2876a30..a18bc8f 100644
--- a/Go-Release-Cycle.md
+++ b/Go-Release-Cycle.md
@@ -32,7 +32,7 @@
 the week starting on the first Monday of the month. All dates are subject to
 change based on the year's holiday timings.
 
-![release](https://user-images.githubusercontent.com/24611692/228010841-fb299331-e7e3-4e64-85dc-66261ce22ea3.svg)
+![release](images/release-cycle.svg)
 
 #### January / July week 1: Planning for release begins.
 
diff --git a/images/release-cycle.png b/images/release-cycle.png
deleted file mode 100644
index 2026f52..0000000
--- a/images/release-cycle.png
+++ /dev/null
Binary files differ
diff --git a/images/release-cycle.svg b/images/release-cycle.svg
new file mode 100644
index 0000000..bed9a96
--- /dev/null
+++ b/images/release-cycle.svg
@@ -0,0 +1,115 @@
+<?xml version="1.0"?>
+<!-- Generated by SVGo -->
+<svg width="600" height="400"
+     xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink">
+<style type="text/css">
+<![CDATA[
+text {
+	fill: black;
+}
+line, path {
+	stroke: black;
+	fill: none;
+}
+@media (prefers-color-scheme: dark) {
+	text {
+		fill: white;
+	}
+	line, path {
+		stroke: white;
+	}
+}
+]]>
+</style>
+<g transform="translate(300,200)">
+<path d="M 0,0 L -100,6.1232339957367574e-15 A 100,100 0 0 0 -86.60254037844386,50.000000000000014 L 0 0" />
+<g transform="rotate(-70) translate(50,0)">
+<text x="0" y="0" >Jan</text>
+</g>
+<path d="M 0,0 L -86.60254037844386,50.000000000000014 A 100,100 0 0 0 -49.99999999999999,86.60254037844388 L 0 0" />
+<g transform="rotate(-39.99999999999999) translate(50,0)">
+<text x="0" y="0" >Feb</text>
+</g>
+<path d="M 0,0 L -49.99999999999999,86.60254037844388 A 100,100 0 0 0 0,100 L 0 0" />
+<g transform="rotate(-9.999999999999996) translate(50,0)">
+<text x="0" y="0" >Mar</text>
+</g>
+<path d="M 0,0 L 0,100 A 100,100 0 0 0 49.99999999999999,86.60254037844388 L 0 0" />
+<g transform="rotate(20) translate(50,0)">
+<text x="0" y="0" >Apr</text>
+</g>
+<path d="M 0,0 L 49.99999999999999,86.60254037844388 A 100,100 0 0 0 86.60254037844386,50.000000000000014 L 0 0" />
+<g transform="rotate(50) translate(50,0)">
+<text x="0" y="0" >May</text>
+</g>
+<path d="M 0,0 L 86.60254037844386,50.000000000000014 A 100,100 0 0 0 100,6.1232339957367574e-15 L 0 0" />
+<g transform="rotate(80) translate(50,0)">
+<text x="0" y="0" >Jun</text>
+</g>
+<path d="M 0,0 L 100,6.1232339957367574e-15 A 100,100 0 0 0 86.60254037844388,-49.99999999999998 L 0 0" />
+<g transform="rotate(110) translate(50,0)">
+<g transform="rotate(180)" transform-origin="13 -3" >
+<text x="0" y="0" >Jul</text>
+</g>
+</g>
+<path d="M 0,0 L 86.60254037844388,-49.99999999999998 A 100,100 0 0 0 49.99999999999999,-86.60254037844388 L 0 0" />
+<g transform="rotate(140) translate(50,0)">
+<g transform="rotate(180)" transform-origin="13 -3" >
+<text x="0" y="0" >Aug</text>
+</g>
+</g>
+<path d="M 0,0 L 49.99999999999999,-86.60254037844388 A 100,100 0 0 0 1.2246467991473515e-14,-100 L 0 0" />
+<g transform="rotate(170.00000000000003) translate(50,0)">
+<g transform="rotate(180)" transform-origin="13 -3" >
+<text x="0" y="0" >Sep</text>
+</g>
+</g>
+<path d="M 0,0 L 1.2246467991473515e-14,-100 A 100,100 0 0 0 -49.99999999999998,-86.60254037844388 L 0 0" />
+<g transform="rotate(200) translate(50,0)">
+<g transform="rotate(180)" transform-origin="13 -3" >
+<text x="0" y="0" >Oct</text>
+</g>
+</g>
+<path d="M 0,0 L -49.99999999999998,-86.60254037844388 A 100,100 0 0 0 -86.60254037844383,-50.00000000000004 L 0 0" />
+<g transform="rotate(229.99999999999997) translate(50,0)">
+<g transform="rotate(180)" transform-origin="13 -3" >
+<text x="0" y="0" >Nov</text>
+</g>
+</g>
+<path d="M 0,0 L -86.60254037844383,-50.00000000000004 A 100,100 0 0 0 -100,-1.8369701987210272e-14 L 0 0" />
+<g transform="rotate(260) translate(50,0)">
+<g transform="rotate(180)" transform-origin="13 -3" >
+<text x="0" y="0" >Dec</text>
+</g>
+</g>
+<path d="M7,-119 A120,120 0 0 1 38,-113" style="stroke-width:10; fill:none; stroke: green" />
+<line x1="7" y1="-114" x2="10" y2="-154" />
+<text x="10" y="-164" style="text-anchor: start" >Summer: Planning</text>
+<path d="M38,-113 A120,120 0 0 1 66,99" style="stroke-width:10; fill:none; stroke: green" />
+<line x1="36" y1="-108" x2="48" y2="-142" />
+<text x="51" y="-151" style="text-anchor: start" >Summer: General development</text>
+<path d="M66,99 A120,120 0 0 1 38,113" style="stroke-width:10; fill:none; stroke: blue" />
+<line x1="63" y1="95" x2="86" y2="128" />
+<text x="91" y="137" style="text-anchor: start" >Summer: Freeze</text>
+<path d="M38,113 A120,120 0 0 1 -79,90" style="stroke-width:10; fill:none; stroke: blue" />
+<line x1="36" y1="108" x2="48" y2="142" />
+<text x="51" y="151" style="text-anchor: start" >Summer: First RC</text>
+<line x1="-75" y1="86" x2="-102" y2="116" />
+<text x="-108" y="124" style="text-anchor: end" >Summer: Release</text>
+<path d="M-9,139 A140,140 0 0 1 -45,132" style="stroke-width:10; fill:none; stroke: green" />
+<line x1="-8" y1="134" x2="-11" y2="174" />
+<text x="-12" y="184" style="text-anchor: end" >Winter: Planning</text>
+<path d="M-45,132 A140,140 0 0 1 -77,-116" style="stroke-width:10; fill:none; stroke: green" />
+<line x1="-43" y1="127" x2="-54" y2="160" />
+<text x="-57" y="170" style="text-anchor: end" >Winter: General development</text>
+<path d="M-77,-116 A140,140 0 0 1 -45,-132" style="stroke-width:10; fill:none; stroke: blue" />
+<line x1="-75" y1="-112" x2="-97" y2="-145" />
+<text x="-102" y="-153" style="text-anchor: end" >Winter: Freeze</text>
+<path d="M-45,-132 A140,140 0 0 1 92,-105" style="stroke-width:10; fill:none; stroke: blue" />
+<line x1="-43" y1="-127" x2="-54" y2="-160" />
+<text x="-57" y="-170" style="text-anchor: end" >Winter: First RC</text>
+<line x1="89" y1="-101" x2="115" y2="-131" />
+<text x="121" y="-139" style="text-anchor: start" >Winter: Release</text>
+</g>
+</svg>