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

tldr/virt-sparsify

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# virt-sparsify
+
+> Make virtual machine drive images thin-provisioned.
+> Note: Use only for offline machines to avoid data corruption.
+> More information: <https://libguestfs.org>.
+
+- Create a sparsified compressed image without snapshots from an unsparsified one:
+
+`virt-sparsify --compress {{path/to/image.qcow2}} {{path/to/image_new.qcow2}}`
+
+- Sparsify an image in-place:
+
+`virt-sparsify --in-place {{path/to/image.img}}`