DVC: add page including sub-commands destroy, diff and fetch

pages/common/dvc-destroy.md

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+# dvc destroy
+
+> Remove all DVC files and directories from a DVC project.
+> More information: <https://dvc.org/doc/command-reference/destroy>.
+
+- Destroy:
+
+`dvc destroy`
+
+- Force Destroy:
+
+`dvc destroy --force`

pages/common/dvc-diff.md

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+# dvc diff
+
+> Show changes in DVC tracked file and directories added/deleted/modified
+> More information: <https://dvc.org/doc/command-reference/diff>.
+
+- Compare DVC tracked file from different Git commit/tag/branch w.r.t current workspace:
+
+`dvc diff {{commit_hash/tag/branch}}`
+
+- Compare DVC tracked file in Git b_rev w.r.t a_rev:
+
+`dvc diff b_rev a_rev`
+
+- Compare DVC tracked file, along with their latest hash:
+
+`dvc diff --show-hash {{commit}}`
+
+- Compare DVC tracked file, get output in JSON format:
+
+`dvc diff --show-json --show-hash {{commit}}`
+
+- Compare DVC tracked file, get output in Markdown format:
+
+`dvc diff --show-md --show-hash {{commit}}`

pages/common/dvc-fetch.md

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+# dvc fetch
+
+> Download DVC tracked files and directories from a remote repository.
+> More information: <https://dvc.org/doc/command-reference/fetch>.
+
+- Fetch the latest changes from the default remote upstream repository (if set):
+
+`dvc fetch`
+
+- Fetch changes from a specific remote upstream repository:
+
+`dvc fetch --remote {{remote_name}}`
+
+- Fetch the latest changes for a specific target/s:
+
+`dvc fetch {{target/s}}`
+
+- Fetch changes for all branch and tags:
+
+`dvc fetch --all-branches --all-tags`
+
+- Fetch changes for all commits:
+
+`dvc fetch --all-commits`