hg-remove: add page (#1859)

pages/common/hg-remove.md

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+# hg remove
+
+> Remove specified files from the staging area.
+
+- Remove files or directories from the staging area:
+
+`hg remove {{path/to/file}}`
+
+- Remove all staged files matching a specified pattern:
+
+`hg remove --include {{pattern}}`
+
+- Remove all staged files, excluding those that match a specified pattern:
+
+`hg remove --exclude {{pattern}}`
+
+- Recursively remove sub-repositories:
+
+`hg remove --subrepos`
+
+- Remove files from the repository that have been physically removed:
+
+`hg remove --after`