Move pages under tldr, lint run.sh, update docs

tldr/dvc-diff

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dvc diff
+
+> Show changes in DVC tracked file and directories.
+> More information: <https://dvc.org/doc/command-reference/diff>.
+
+- Compare DVC tracked files from different Git commits, tags, and branches w.r.t the current workspace:
+
+`dvc diff {{commit_hash/tag/branch}}`
+
+- Compare the changes in DVC tracked files from 1 Git commit to another:
+
+`dvc diff {{revision1}} {{revision2}}`
+
+- Compare DVC tracked files, along with their latest hash:
+
+`dvc diff --show-hash {{commit}}`
+
+- Compare DVC tracked files, displaying the output as JSON:
+
+`dvc diff --show-json --show-hash {{commit}}`
+
+- Compare DVC tracked files, displaying the output as Markdown:
+
+`dvc diff --show-md --show-hash {{commit}}`