Add Shakepay and Newton Crypto icons (#2634)

## Description

* Adds icons for Shakepay and Newton Crypto exchanges
* Shakepay icon derived from [press
kit](https://shakepay.com/images/shakepay_media_assets_2023.zip)
* Newton icon derived from [homepage](https://newton.co) (their press
kit leads to 404)

## Tests

auth/assets/custom-icons/_data/custom-icons.json

@@ -652,6 +652,15 @@
       ],
       "slug": "ynab",
       "hex": "3B5EDA"
+    },
+    {
+      "title": "Shakepay",
+      "slug": "shakepay"
+    },
+    {
+      "title": "Newton",
+      "altNames": ["Newton Crypto"],
+      "slug": "newton"
     }
   ]
 }

auth/assets/custom-icons/icons/newton.svg

@@ -0,0 +1,4 @@
+<svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M20.2324 2.78628H21.214V21.2136H9.76734V8.77878C9.76734 8.05185 9.17804 7.46255 8.4511 7.46255C7.72416 7.46255 7.13486 8.05185 7.13486 8.77878V22.5298C7.13486 23.2568 7.72416 23.8461 8.4511 23.8461H22.5302C23.2572 23.8461 23.8465 23.2568 23.8465 22.5298V1.47005C23.8465 0.743108 23.2572 0.153809 22.5302 0.153809H20.2324C19.5055 0.153809 18.9162 0.743108 18.9162 1.47005C18.9162 2.19698 19.5055 2.78628 20.2324 2.78628Z" fill="currentColor"></path>
+<path d="M3.76836 21.2136H2.78677V2.78632H14.2331V15.2211C14.2331 15.9481 14.8224 16.5374 15.5493 16.5374C16.2763 16.5374 16.8656 15.9481 16.8656 15.2211V1.47008C16.8656 0.743141 16.2763 0.153841 15.5493 0.153841H1.47053C0.743596 0.153841 0.154297 0.743141 0.154297 1.47008V22.5299C0.154297 23.2568 0.743596 23.8461 1.47053 23.8461H3.76836C4.49529 23.8461 5.08459 23.2568 5.08459 22.5299C5.08459 21.8029 4.49529 21.2136 3.76836 21.2136Z" fill="#2FE1B9"></path>
+</svg>

auth/assets/custom-icons/icons/shakepay.svg

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 26.0.3, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<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 0 545.5 445.6" style="enable-background:new 0 0 545.5 445.6;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill-rule:evenodd;clip-rule:evenodd;fill:#00A2FF;}
+</style>
+<g>
+	<path class="st0" d="M302.5,316.3c-2.1-0.5-4.2-1-6.2-1.4c-14.7-2.9-29.8-3-44.5-0.3c-1.8,0.3-3.6,0.7-5.4,1.2
+		c-11.2,2.8-13.9,9.2-8.8,19.4c5.8,12,15.1,20.8,27.2,26.7c5.9,3,12.9,2.9,18.7-0.2c11.9-5.9,21.4-15.7,27-27.7
+		C314.8,324.4,312.7,318.9,302.5,316.3z"/>
+	<path class="st0" d="M507.2,11.2c-34-35.7-158.2,24.1-184.7,37.4c-3.3,1.7-7,2.6-10.8,2.6h-38.3l-38.7,0.1c-3.8,0-7.5-0.9-10.9-2.6
+		C197.3,35.3,73.2-24.4,39.3,11.2C1.2,51.2-11.1,314.6,11,340.4c11.5,13.4,90,57.8,152.4,81.5c23,8.9,62.5,23.7,110,23.7
+		c46.1,0,87.8-14,109.2-23.5c98.7-43.3,140.2-67.4,151.7-80.8C556.3,315.5,545.3,51.2,507.2,11.2z M374.2,66.8
+		c0,0,25.3-18.2,61.9-27.1c5-1.2,10.1-1.8,15.3-1.7c18.6,0,32.8,12.1,37.3,30.9c0,0,8.3,36.7,8.7,69.9c0.1,11.1-8.4,18.9-18.9,18.9
+		c-2.8,0-5.6-0.7-8.1-1.9h-0.1l-97.2-56l0,0c-5.3-3.1-8.7-8.6-9.2-14.7c0-0.5-0.1-1-0.1-1.5C363.8,76.3,368,70.9,374.2,66.8
+		L374.2,66.8z M57.1,69c4.4-18.9,18.7-30.9,37.3-30.9c5.2-0.1,10.3,0.4,15.3,1.7c36.6,8.9,61.9,27.1,61.9,27.1
+		c6.3,4.1,10.4,9.5,10.4,16.8c0,0.5,0,1-0.1,1.5c-0.5,6.1-3.9,11.6-9.2,14.7l0,0L75.4,156h-0.1c-2.5,1.2-5.3,1.8-8.1,1.9
+		c-10.4,0-19-7.8-18.9-18.9C48.8,105.6,57.1,69,57.1,69L57.1,69z M133.8,261.9l-0.1,0.1l-41.8,27.6c-12.1,8-16.2,12.1-19.3,17.7
+		c-2.7,4.7-3.6,10.2-3.7,15.6c0,6.1-2.2,9.9-3.9,11.7c-4,4.1-8.9,5-14.5,3.5c-2.4-0.6-4.7-1.7-6.6-3.3c-20-16.4-22.3-48.4-5.1-71.2
+		c10.8-14.4,18.4-18.5,64.1-48.6s52.5-35.4,70-39.7c27.7-6.8,56.2,7.9,63.4,32.8c0.7,2.4,0.8,4.9,0.4,7.3c-0.8,5.7-3.5,9.9-8.9,11.9
+		c-2.3,0.9-6.7,1.3-12.3-1c-5-2.2-10.4-3.2-15.8-2.8c-6.4,0.7-11.8,2.8-23.9,10.7L134,261.8L133.8,261.9z M385,364.2
+		c-7.9,9.8-17.8,19.2-28.6,24.9c-55,29.2-110.9,29-165.9-0.2c-10.6-5.6-20.3-14.8-28.1-24.4c-14.3-17.7-13.8-39.8-0.5-58.5
+		c8.1-11.4,18.8-19.5,30.6-26c25.5-13.9,52.7-19.7,81.2-19.9c29.5,0.3,57.9,5.9,83.5,21.8c10.6,6.6,20.1,14.9,27.9,24.7
+		C399.2,324.3,399,346.8,385,364.2L385,364.2z M501.9,334.8c-1.9,1.6-4.2,2.7-6.6,3.3c-5.5,1.5-10.5,0.7-14.5-3.5
+		c-1.7-1.8-3.9-5.6-3.9-11.7c0.1-5.4-1.1-10.8-3.7-15.6c-3.1-5.6-7.2-9.7-19.3-17.7L412,262l-0.1-0.1l-0.1-0.1L370,234.2
+		c-12.1-8-17.5-10.1-23.9-10.7c-5.4-0.6-10.8,0.7-15.8,2.8c-5.6,2.4-10,1.9-12.3,1c-5.4-2-8.1-6.2-8.9-11.9
+		c-0.4-2.4-0.3-4.9,0.4-7.3c7.2-24.8,35.7-39.6,63.4-32.8c17.5,4.3,24.3,9.6,70,39.7c45.7,30.1,53.3,34.3,64.1,48.6
+		C524.2,286.4,521.9,318.5,501.9,334.8L501.9,334.8z"/>
+</g>
+</svg>