debchange, debuild, dget, quilt: add pages (#4022)

pages/common/quilt.md

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+# quilt
+
+> Tool to manage a series of patches.
+> More information: <https://savannah.nongnu.org/projects/quilt>.
+
+- Import an existing patch from a file:
+
+`quilt import {{path/to/filename.patch}}`
+
+- Create a new patch:
+
+`quilt new {{filename.patch}}`
+
+- Add a file to the current patch:
+
+`quilt add {{path/to/file}}`
+
+- After editing the file, refresh the current patch with the changes:
+
+`quilt refresh`
+
+- Apply all the patches in the series file:
+
+`quilt push -a`
+
+- Remove all applied patches:
+
+`quilt pop -a`