add offline functionality by making this a PWA

- added favicons
- added manifest
- split javascript into main.js and elevators.js

icons/favicon-maskable.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="100mm"
+   height="100mm"
+   viewBox="0 0 100 100"
+   version="1.1"
+   id="svg1"
+   xml:space="preserve"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+     id="defs1" /><g
+     id="layer1"
+     transform="translate(-104.49603,0.25552651)"><rect
+       style="fill:#65a30d;fill-opacity:1;stroke:none;stroke-width:0.499507;stroke-linejoin:round;paint-order:markers stroke fill"
+       id="rect1-1"
+       width="100"
+       height="100.00012"
+       x="104.49603"
+       y="-0.25558716" /><path
+       d="m 142.75747,64.972903 h 7.61422 V 54.820616 h 2.53804 V 48.47544 q 0,-2.093907 -1.49109,-3.585027 -1.49109,-1.49111 -3.58499,-1.49111 h -2.53813 q -2.0939,0 -3.58499,1.49111 -1.49109,1.49112 -1.49109,3.585027 v 6.345176 h 2.53803 z m 3.80716,-24.111679 q 1.33243,0 2.25246,-0.920037 0.91995,-0.920037 0.91995,-2.252542 0,-1.332485 -0.91995,-2.252532 -0.91993,-0.920036 -2.25246,-0.920036 -1.33252,0 -2.25256,0.920036 -0.91994,0.920037 -0.91994,2.252532 0,1.332495 0.91994,2.252542 0.91994,0.920037 2.25256,0.920037 z m 9.96184,6.345176 h 12.6904 l -6.3452,-10.152274 z m 6.3452,15.228432 6.3452,-10.152284 h -12.6904 z m -25.38069,12.309636 q -3.36291,0 -5.67889,-2.315986 -2.31606,-2.315986 -2.31606,-5.678936 V 32.7394 q 0,-3.362945 2.31606,-5.678933 2.31598,-2.315988 5.67889,-2.315988 h 34.01019 q 3.36292,0 5.67889,2.315988 2.31597,2.315988 2.31597,5.678933 v 34.010146 q 0,3.36295 -2.31597,5.678936 -2.31597,2.315986 -5.67889,2.315986 z"
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+       style="fill:#ffffff;fill-opacity:1;stroke-width:0.0634518" /></g></svg>

icons/favicon-transparent.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="100mm"
+   height="100mm"
+   viewBox="0 0 100 100"
+   version="1.1"
+   id="svg1"
+   xml:space="preserve"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+     id="defs1" /><g
+     id="layer1"
+     transform="translate(-214.49603)"><path
+       d="m 248.06205,71.319802 h 10.65991 V 57.1066 h 3.55325 v -8.883247 q 0,-2.931469 -2.08753,-5.019037 -2.08752,-2.087555 -5.01898,-2.087555 h -3.55339 q -2.93146,0 -5.01898,2.087555 -2.08753,2.087568 -2.08753,5.019037 V 57.1066 h 3.55325 z m 5.33002,-33.756351 q 1.8654,0 3.15345,-1.288052 1.28792,-1.288051 1.28792,-3.153558 0,-1.865479 -1.28792,-3.153545 -1.28791,-1.288051 -3.15345,-1.288051 -1.86553,0 -3.15358,1.288051 -1.28792,1.288052 -1.28792,3.153545 0,1.865493 1.28792,3.153558 1.28791,1.288052 3.15358,1.288052 z m 13.94658,8.883247 h 17.76655 l -8.88328,-14.213184 z m 8.88327,21.319804 8.88328,-14.213198 h -17.76655 z m -35.53296,17.23349 q -4.70808,0 -7.95044,-3.24238 -3.24249,-3.24238 -3.24249,-7.95051 V 26.192898 q 0,-4.708124 3.24249,-7.950507 3.24236,-3.242383 7.95044,-3.242383 h 47.61427 q 4.70809,0 7.95044,3.242383 3.24236,3.242383 3.24236,7.950507 v 47.614204 q 0,4.70813 -3.24236,7.95051 -3.24235,3.24238 -7.95044,3.24238 z"
+       id="path1-3"
+       style="fill:#000000;fill-opacity:1;stroke-width:0.0888325" /></g></svg>

icons/favicon.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="100mm"
+   height="100mm"
+   viewBox="0 0 100 100"
+   version="1.1"
+   id="svg1"
+   xml:space="preserve"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+     id="defs1" /><g
+     id="layer1"><rect
+       style="opacity:1;fill:#65a30d;fill-opacity:1;stroke:none;stroke-width:0.499507;stroke-linejoin:round;paint-order:markers stroke fill"
+       id="rect1"
+       width="100"
+       height="100.00012"
+       x="-3.3306691e-15"
+       y="-6.1035156e-05" /><path
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+       style="fill:#ffffff;fill-opacity:1;stroke-width:0.0888325" /></g></svg>