Rediseño de la interfaz y arreglos menores

- ¡Ahora con tema oscuro! Se activa según el navegador del usuario.
- URL de audios simplificada.
- Nuevos iconos para canciones con acordes/audios.
- Enlaces de la cabecera actualizados.
- Siempre mostramos los ajustes.
- Insertar espacio forzoso para separar algunas palabras que se juntaban.
- Soporte para canciones con dos líneas de acordes (e.g. Engrandece).

res/static/file-audio.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 384 512"><!--! Font Awesome Pro 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. --><path d="M64 0C28.7 0 0 28.7 0 64V448c0 35.3 28.7 64 64 64H320c35.3 0 64-28.7 64-64V160H256c-17.7 0-32-14.3-32-32V0H64zM256 0V128H384L256 0zm2 226.3c37.1 22.4 62 63.1 62 109.7s-24.9 87.3-62 109.7c-7.6 4.6-17.4 2.1-22-5.4s-2.1-17.4 5.4-22C269.4 401.5 288 370.9 288 336s-18.6-65.5-46.5-82.3c-7.6-4.6-10-14.4-5.4-22s14.4-10 22-5.4zm-91.9 30.9c6 2.5 9.9 8.3 9.9 14.8V400c0 6.5-3.9 12.3-9.9 14.8s-12.9 1.1-17.4-3.5L113.4 376H80c-8.8 0-16-7.2-16-16V312c0-8.8 7.2-16 16-16h33.4l35.3-35.3c4.6-4.6 11.5-5.9 17.4-3.5zm51 34.9c6.6-5.9 16.7-5.3 22.6 1.3C249.8 304.6 256 319.6 256 336s-6.2 31.4-16.3 42.7c-5.9 6.6-16 7.1-22.6 1.3s-7.1-16-1.3-22.6c5.1-5.7 8.1-13.1 8.1-21.3s-3.1-15.7-8.1-21.3c-5.9-6.6-5.3-16.7 1.3-22.6z"/></svg>

res/static/gear.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--! Font Awesome Pro 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. --><path d="M495.9 166.6c3.2 8.7 .5 18.4-6.4 24.6l-43.3 39.4c1.1 8.3 1.7 16.8 1.7 25.4s-.6 17.1-1.7 25.4l43.3 39.4c6.9 6.2 9.6 15.9 6.4 24.6c-4.4 11.9-9.7 23.3-15.8 34.3l-4.7 8.1c-6.6 11-14 21.4-22.1 31.2c-5.9 7.2-15.7 9.6-24.5 6.8l-55.7-17.7c-13.4 10.3-28.2 18.9-44 25.4l-12.5 57.1c-2 9.1-9 16.3-18.2 17.8c-13.8 2.3-28 3.5-42.5 3.5s-28.7-1.2-42.5-3.5c-9.2-1.5-16.2-8.7-18.2-17.8l-12.5-57.1c-15.8-6.5-30.6-15.1-44-25.4L83.1 425.9c-8.8 2.8-18.6 .3-24.5-6.8c-8.1-9.8-15.5-20.2-22.1-31.2l-4.7-8.1c-6.1-11-11.4-22.4-15.8-34.3c-3.2-8.7-.5-18.4 6.4-24.6l43.3-39.4C64.6 273.1 64 264.6 64 256s.6-17.1 1.7-25.4L22.4 191.2c-6.9-6.2-9.6-15.9-6.4-24.6c4.4-11.9 9.7-23.3 15.8-34.3l4.7-8.1c6.6-11 14-21.4 22.1-31.2c5.9-7.2 15.7-9.6 24.5-6.8l55.7 17.7c13.4-10.3 28.2-18.9 44-25.4l12.5-57.1c2-9.1 9-16.3 18.2-17.8C227.3 1.2 241.5 0 256 0s28.7 1.2 42.5 3.5c9.2 1.5 16.2 8.7 18.2 17.8l12.5 57.1c15.8 6.5 30.6 15.1 44 25.4l55.7-17.7c8.8-2.8 18.6-.3 24.5 6.8c8.1 9.8 15.5 20.2 22.1 31.2l4.7 8.1c6.1 11 11.4 22.4 15.8 34.3zM256 336a80 80 0 1 0 0-160 80 80 0 1 0 0 160z"/></svg>

res/static/guitar.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--! Font Awesome Pro 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. --><path d="M465 7c-9.4-9.4-24.6-9.4-33.9 0L383 55c-2.4 2.4-4.3 5.3-5.5 8.5l-15.4 41-77.5 77.6c-45.1-29.4-99.3-30.2-131 1.6c-11 11-18 24.6-21.4 39.6c-3.7 16.6-19.1 30.7-36.1 31.6c-25.6 1.3-49.3 10.7-67.3 28.6C-16 328.4-7.6 409.4 47.5 464.5s136.1 63.5 180.9 18.7c17.9-17.9 27.4-41.7 28.6-67.3c.9-17 15-32.3 31.6-36.1c15-3.4 28.6-10.5 39.6-21.4c31.8-31.8 31-85.9 1.6-131l77.6-77.6 41-15.4c3.2-1.2 6.1-3.1 8.5-5.5l48-48c9.4-9.4 9.4-24.6 0-33.9L465 7zM208 256a48 48 0 1 1 0 96 48 48 0 1 1 0-96z"/></svg>

res/static/music.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--! Font Awesome Pro 6.4.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license (Commercial License) Copyright 2023 Fonticons, Inc. --><path d="M499.1 6.3c8.1 6 12.9 15.6 12.9 25.7v72V368c0 44.2-43 80-96 80s-96-35.8-96-80s43-80 96-80c11.2 0 22 1.6 32 4.6V147L192 223.8V432c0 44.2-43 80-96 80s-96-35.8-96-80s43-80 96-80c11.2 0 22 1.6 32 4.6V200 128c0-14.1 9.3-26.6 22.8-30.7l320-96c9.7-2.9 20.2-1.1 28.3 5z"/></svg>