Adds ability for user to show/ hide settings menu

For a cleaner, less clutterd UI

src/assets/interface-icons/config-close.svg

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+<svg aria-hidden="true" focusable="false" data-prefix="far" data-icon="times-circle" class="svg-inline--fa fa-times-circle fa-w-16" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm0 448c-110.5 0-200-89.5-200-200S145.5 56 256 56s200 89.5 200 200-89.5 200-200 200zm101.8-262.2L295.6 256l62.2 62.2c4.7 4.7 4.7 12.3 0 17l-22.6 22.6c-4.7 4.7-12.3 4.7-17 0L256 295.6l-62.2 62.2c-4.7 4.7-12.3 4.7-17 0l-22.6-22.6c-4.7-4.7-4.7-12.3 0-17l62.2-62.2-62.2-62.2c-4.7-4.7-4.7-12.3 0-17l22.6-22.6c4.7-4.7 12.3-4.7 17 0l62.2 62.2 62.2-62.2c4.7-4.7 12.3-4.7 17 0l22.6 22.6c4.7 4.7 4.7 12.3 0 17z"></path></svg>

src/assets/interface-icons/config-open-settings.svg

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+<svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="sliders-h" class="svg-inline--fa fa-sliders-h fa-w-16" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M496 384H160v-16c0-8.8-7.2-16-16-16h-32c-8.8 0-16 7.2-16 16v16H16c-8.8 0-16 7.2-16 16v32c0 8.8 7.2 16 16 16h80v16c0 8.8 7.2 16 16 16h32c8.8 0 16-7.2 16-16v-16h336c8.8 0 16-7.2 16-16v-32c0-8.8-7.2-16-16-16zm0-160h-80v-16c0-8.8-7.2-16-16-16h-32c-8.8 0-16 7.2-16 16v16H16c-8.8 0-16 7.2-16 16v32c0 8.8 7.2 16 16 16h336v16c0 8.8 7.2 16 16 16h32c8.8 0 16-7.2 16-16v-16h80c8.8 0 16-7.2 16-16v-32c0-8.8-7.2-16-16-16zm0-160H288V48c0-8.8-7.2-16-16-16h-32c-8.8 0-16 7.2-16 16v16H16C7.2 64 0 71.2 0 80v32c0 8.8 7.2 16 16 16h208v16c0 8.8 7.2 16 16 16h32c8.8 0 16-7.2 16-16v-16h208c8.8 0 16-7.2 16-16V80c0-8.8-7.2-16-16-16z"></path></svg>