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

tldr/linux/nsxiv

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nsxiv
+
+> Neo Simple X Image Viewer.
+> More information: <https://nsxiv.codeberg.page/man>.
+
+- Open images:
+
+`nsxiv {{path/to/file1 path/to/file2 ...}}`
+
+- Open images from directories in image mode:
+
+`nsxiv {{path/to/directory1 path/to/directory2 ...}}`
+
+- Search directories recursively for images to view:
+
+`nsxiv -r {{path/to/directory1 path/to/directory2 ...}}`
+
+- Quit nsxiv:
+
+`q`
+
+- Switch to thumbnail mode or open selected image in image mode:
+
+`<Return>`
+
+- Count images forward in image mode:
+
+`n`
+
+- Count images backward in image mode:
+
+`p`