diff --git a/assets/symbols/snake.svg b/assets/symbols/snake.svg
deleted file mode 100644
index 391ceb6..0000000
--- a/assets/symbols/snake.svg
+++ /dev/null
@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Moho 12.5 build 22414 -->
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg version="1.1" id="Frame_0" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="720px" height="720px">
-<g id="snake">
-<g id="snake_2">
-<path fill="#ffffff" fill-rule="evenodd" stroke="#000000" stroke-width="4" stroke-linejoin="round" d="M 644.601 303.981 C 644.601 300.747 647.210 298.138 650.444 298.138 C 653.678 298.138 656.287 300.747 656.287 303.981 C 656.287 307.215 653.678 309.824 650.444 309.824 C 647.210 309.824 644.601 307.215 644.601 303.981 M 139.072 390.929 C 103.145 391.333 57.801 333.828 54.570 336.836 C 50.809 340.336 96.065 415.926 139.072 417.408 C 187.181 419.066 209.438 333.727 236.215 334.019 C 265.568 334.339 286.942 421.862 333.358 421.862 C 379.774 421.862 399.092 334.424 430.501 334.019 C 464.410 333.581 481.022 422.370 527.644 421.862 C 572.943 421.369 583.722 344.800 620.610 334.971 C 628.237 332.939 635.985 336.118 646.762 337.863 C 661.373 340.227 681.721 335.164 681.724 335.164 C 681.721 335.163 652.303 319.116 652.300 319.114 C 652.304 319.113 689.132 313.209 689.136 313.208 C 689.128 313.207 666.664 275.564 615.433 298.704 C 571.235 318.666 557.602 385.506 527.644 386.475 C 496.188 387.492 484.391 299.510 430.501 299.561 C 387.307 299.601 360.309 386.963 333.358 386.475 C 306.983 385.998 284.806 299.058 236.215 299.561 C 186.501 300.075 172.678 390.552 139.072 390.929 Z"/>
-<path fill="#000000" d="M 698.183 329.276 C 701.683 327.932 705.734 328.022 709.234 326.678 L 709.510 327.395 C 706.010 328.740 703.062 331.520 699.562 332.865 L 698.183 329.276 Z"/>
-<path fill="#000000" d="M 652.599 317.215 C 652.421 317.196 668.541 318.199 674.711 320.447 L 673.371 324.051 C 667.992 322.004 652.184 321.033 652.002 321.013 L 652.599 317.215 Z"/>
-<path fill="none" stroke="#000000" stroke-width="1" stroke-linecap="butt" stroke-linejoin="round" d="M 652.599 317.215 L 652.002 321.013 "/>
-<path fill="#000000" d="M 674.711 320.447 C 680.915 322.793 683.271 325.659 689.541 328.033 L 688.164 331.622 C 681.285 328.951 678.904 326.070 673.371 324.051 L 674.711 320.447 Z"/>
-<path fill="none" stroke="#000000" stroke-width="1" stroke-linecap="butt" stroke-linejoin="round" d="M 674.711 320.447 L 673.371 324.051 "/>
-<path fill="#000000" d="M 689.541 328.033 C 692.374 329.181 698.866 329.148 699.085 329.160 L 698.660 332.981 C 698.877 332.993 691.901 332.996 688.164 331.622 L 689.541 328.033 Z"/>
-<path fill="none" stroke="#000000" stroke-width="1" stroke-linecap="butt" stroke-linejoin="round" d="M 689.541 328.033 L 688.164 331.622 "/>
-<path fill="#000000" d="M 699.952 329.480 C 699.952 329.480 704.850 335.120 707.839 337.145 L 707.839 337.145 C 704.850 335.120 697.795 332.663 697.793 332.661 L 699.952 329.480 Z"/>
-<path fill="none" stroke="#000000" stroke-width="1" stroke-linecap="butt" stroke-linejoin="round" d="M 699.952 329.480 L 697.793 332.661 "/>
-</g>
-<g id="specs_2">
-<path fill="#ff0000" fill-rule="evenodd" stroke="none" d="M 44.747 360.000 C 44.744 360.001 11.336 371.932 11.332 371.934 C 11.334 371.932 22.435 360.001 22.436 360.000 C 22.435 359.999 11.334 348.068 11.332 348.066 C 11.336 348.068 44.744 359.999 44.747 360.000 Z"/>
-<path fill="#0000ff" fill-rule="evenodd" stroke="none" d="M 649.426 270.816 C 649.426 270.818 656.357 290.224 656.357 290.226 C 656.357 290.226 649.426 283.777 649.426 283.777 C 649.425 283.777 642.494 290.226 642.494 290.226 C 642.494 290.224 649.425 270.818 649.426 270.816 Z"/>
-<path fill="#ffff00" fill-rule="evenodd" stroke="none" d="M 528.825 435.505 C 528.826 435.503 535.596 416.040 535.597 416.038 C 535.596 416.039 528.719 422.545 528.718 422.545 C 528.718 422.545 521.734 416.154 521.733 416.153 C 521.734 416.155 528.824 435.503 528.825 435.505 Z"/>
-<path fill="#00ff00" fill-rule="evenodd" stroke="none" d="M 432.777 284.781 C 432.776 284.783 425.747 304.154 425.747 304.156 C 425.747 304.156 432.711 297.742 432.712 297.742 C 432.712 297.742 439.610 304.226 439.611 304.226 C 439.610 304.224 432.778 284.783 432.777 284.781 Z"/>
-<path fill="#be0027" fill-rule="evenodd" stroke="none" d="M 46.846 329.183 C 46.847 329.185 55.006 348.107 55.007 348.109 C 55.007 348.108 55.682 338.665 55.682 338.664 C 55.683 338.664 65.149 338.657 65.150 338.657 C 65.148 338.656 46.848 329.184 46.846 329.183 Z"/>
-<path fill="#00ff00" fill-rule="evenodd" stroke="none" d="M 236.711 284.782 C 236.710 284.783 229.681 304.154 229.680 304.156 C 229.681 304.156 236.645 297.742 236.645 297.742 C 236.646 297.742 243.544 304.226 243.544 304.226 C 243.544 304.224 236.711 284.783 236.711 284.782 Z"/>
-<path fill="#ffff00" fill-rule="evenodd" stroke="none" d="M 333.764 435.505 C 333.765 435.503 340.536 416.040 340.536 416.038 C 340.536 416.039 333.658 422.545 333.658 422.545 C 333.657 422.545 326.673 416.154 326.672 416.153 C 326.673 416.155 333.763 435.503 333.764 435.505 Z"/>
-<path fill="#ffff00" fill-rule="evenodd" stroke="none" d="M 142.725 435.505 C 142.726 435.503 149.496 416.040 149.497 416.038 C 149.496 416.039 142.619 422.545 142.618 422.545 C 142.618 422.545 135.634 416.154 135.633 416.153 C 135.634 416.155 142.724 435.503 142.725 435.505 Z"/>
-<path fill="#00ffff" fill-rule="evenodd" stroke="none" d="M 706.184 326.814 C 706.182 326.814 686.776 333.745 686.774 333.745 C 686.775 333.745 693.223 326.814 693.224 326.814 C 693.223 326.813 686.775 319.882 686.774 319.882 C 686.776 319.882 706.182 326.813 706.184 326.814 Z"/>
-</g>
-</g>
-</svg>