diff --git a/assets/symbols/hill_BWgradient.svg b/assets/symbols/hill_BWgradient.svg
deleted file mode 100644
index 9910b8d..0000000
--- a/assets/symbols/hill_BWgradient.svg
+++ /dev/null
@@ -1,28 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Generator: Moho 13.5 build 20210422 -->
-<!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="gradients">
-</g>
-<g id="BW_gradients">
-<g id="hill_new">
-<radialGradient id="1BF10256-5B56-4B65-A9D4-149CCA163B66_0" cx="50.00%" cy="100.93%" r="100.00%">
-<stop offset="72.94%" style="stop-color:rgb(255,255,255);stop-opacity:1.00" />
-<stop offset="100.00%" style="stop-color:rgb(0,0,0);stop-opacity:1.00" />
-</radialGradient>
-<path id="S1" fill="url(#1BF10256-5B56-4B65-A9D4-149CCA163B66_0)" fill-rule="evenodd" stroke="none" d="M 700.000 530.000 C 700.000 330.000 548.188 190.000 360.000 190.000 C 171.812 190.000 20.000 330.000 20.000 530.000 C 20.000 530.000 699.932 530.000 700.000 530.000 Z"/>
-</g>
-<g id="specs">
-<path fill="#ff00ff" fill-rule="evenodd" stroke="none" d="M 223.420 496.580 C 223.447 496.580 496.553 496.580 496.580 496.580 C 496.580 496.553 496.580 223.447 496.580 223.420 C 496.553 223.420 223.447 223.420 223.420 223.420 C 223.420 223.447 223.420 496.553 223.420 496.580 Z"/>
-<path fill="#ff0000" fill-rule="evenodd" stroke="none" d="M 360.000 504.357 C 360.001 504.361 372.416 539.123 372.417 539.127 C 372.416 539.126 360.001 527.574 360.000 527.573 C 359.999 527.574 347.584 539.126 347.583 539.127 C 347.584 539.123 359.999 504.361 360.000 504.357 Z"/>
-<path fill="#0000ff" fill-rule="evenodd" stroke="none" d="M 360.000 163.756 C 360.001 163.758 367.212 183.951 367.213 183.953 C 367.212 183.952 360.001 177.243 360.000 177.242 C 359.999 177.243 352.788 183.952 352.787 183.953 C 352.788 183.951 359.999 163.758 360.000 163.756 Z"/>
-<path fill="#00ff00" fill-rule="evenodd" stroke="none" d="M 18.822 361.002 C 18.824 361.002 38.981 353.687 38.983 353.687 C 38.982 353.687 32.308 360.933 32.308 360.934 C 32.308 360.935 39.055 368.112 39.055 368.113 C 39.053 368.112 18.824 361.003 18.822 361.002 Z"/>
-<path fill="#ffff00" fill-rule="evenodd" stroke="none" d="M 118.004 603.196 C 118.005 603.194 126.954 583.709 126.955 583.707 C 126.955 583.708 127.426 593.548 127.426 593.549 C 127.427 593.549 137.274 593.787 137.275 593.787 C 137.273 593.788 118.006 603.195 118.004 603.196 Z"/>
-<path fill="#ffff00" fill-rule="evenodd" stroke="none" d="M 601.996 602.958 C 601.995 602.956 592.657 583.654 592.656 583.652 C 592.656 583.653 592.383 593.500 592.383 593.501 C 592.382 593.501 582.540 593.937 582.539 593.937 C 582.541 593.938 601.994 602.957 601.996 602.958 Z"/>
-<path fill="#00ff00" fill-rule="evenodd" stroke="none" d="M 701.178 361.002 C 701.176 361.002 681.019 353.687 681.017 353.687 C 681.018 353.687 687.692 360.933 687.692 360.934 C 687.692 360.935 680.945 368.112 680.945 368.113 C 680.947 368.112 701.176 361.003 701.178 361.002 Z"/>
-<path fill="#00ffff" fill-rule="evenodd" stroke="none" d="M 601.061 236.069 C 601.060 236.071 593.902 256.283 593.901 256.285 C 593.901 256.284 592.546 246.527 592.546 246.526 C 592.545 246.526 582.716 247.175 582.715 247.175 C 582.717 247.174 601.059 236.070 601.061 236.069 Z"/>
-<path fill="#00ffff" fill-rule="evenodd" stroke="none" d="M 119.051 236.739 C 119.051 236.741 127.541 256.430 127.542 256.432 C 127.542 256.431 128.244 246.606 128.244 246.605 C 128.245 246.605 138.095 246.597 138.096 246.597 C 138.094 246.596 119.052 236.740 119.051 236.739 Z"/>
-<path fill="#be0027" fill-rule="evenodd" stroke="none" d="M 360.000 553.895 C 360.001 553.891 372.416 519.129 372.417 519.125 C 372.416 519.126 360.001 530.678 360.000 530.679 C 359.999 530.678 347.584 519.126 347.583 519.125 C 347.584 519.129 359.999 553.891 360.000 553.895 Z"/>
-</g>
-</g>
-</svg>