feature: add commit mono font (ublue-os#631)

usr/share/fonts/commit-mono/custom-settings.json

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+{"weight":400,"italic":false,"alternates":{"cv01":false,"cv02":false,"cv03":false,"cv04":false,"cv05":false,"cv06":false,"cv07":false,"cv08":false,"cv09":false},"features":{"ss01":false,"ss02":false,"ss03":true,"ss04":true,"ss05":true},"letterSpacing":0,"lineHeight":1}

usr/share/fonts/commit-mono/installation.txt

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+A short guide for how to install and enable your shiny new version of Commit Mono.
+This is taken from section 08 Install from https://commitmono.com/
+
+#1 (Download the fonts)
+#2 Unzip the fonts. You'll see 4 font files. These 4 fonts make up a 'Style Group':
+   * CommitMono-Regular: Base version with settings and weight of your choice.
+   * CommitMono-Italic: An italic version, same weight as regular.
+   * CommitMono-Bold: A bold version, weight 700.
+   * CommitMono-BoldItalic: A bold version, weight 700, that is also italic.
+#3 Install all 4 fonts on your system:
+   * Windows: Right click the font in the folder and click "Install

usr/share/fonts/commit-mono/license.txt

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+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the compon