gh-skyline: add page

pages/common/gh-skyline.md

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+# gh skyline
+
+> Generate a 3D model of your GitHub contribution history.
+> By default, it will create a `{username}-{year}-github-skyline.stl` file in the current directory.
+> More information: <https://github.com/github/gh-skyline>.
+
+- Generate a skyline STL file for the current year and authenticated user:
+
+`gh skyline`
+
+- Generate a skyline for a specific [u]ser and [y]ear:
+
+`gh skyline --user {{username}} --year {{year}}`
+
+- Generate a skyline for a range of [y]ears:
+
+`gh skyline --user {{username}} --year {{first_year}}-{{last_year}}`
+
+- Generate a [f]ull skyline (from the user's join year to the current year):
+
+`gh skyline --user {{username}} --full`
+
+- Enable [d]ebug logging:
+
+`gh skyline --debug`
+
+- Generate a skyline and specify the [o]utput file path:
+
+`gh skyline --output {{path/to/output_file.stl}}`
+
+- Open the GitHub profile for a specific [u]ser:
+
+`gh skyline --user {{username}} --web`
+
+- Display [h]elp:
+
+`gh skyline --help`