fossil-delete, fossil-forget, fossil-rm: add page (#7115)

pages/linux/fossil-delete.md

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+# fossil delete
+
+> This command is an alias of `fossil rm`.
+> More information: <https://fossil-scm.org/home/help>.
+
+- View documentation for the original command:
+
+`tldr fossil rm`

pages/linux/fossil-forget.md

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+# fossil forget
+
+> This command is an alias of `fossil rm`, with the exception that it never removes files from the disk.
+> More information: <https://fossil-scm.org/home/help>.
+
+- View documentation for the original command:
+
+`tldr fossil rm`

pages/linux/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`