fossil*: move all fossil commands to common vs linux (#8677)

fossil commands work substantially the same on all major platforms.

pages/common/fossil-rm.md

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+# fossil rm
+
+> Remove files or directories from Fossil version control.
+> See also `fossil forget`.
+> More information: <https://fossil-scm.org/home/help>.
+
+- Remove a file or directory from Fossil version control:
+
+`fossil rm {{path/to/file_or_directory}}`
+
+- Remove a file or directory from Fossil version control, and also delete it from the disk:
+
+`fossil rm --hard {{path/to/file_or_directory}}`
+
+- Re-add all previously removed and uncommitted files to Fossil version control:
+
+`fossil rm --reset`