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

tldr/pdfjoin

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pdfjoin
+
+> PDF merging utility based on pdfjam.
+> More information: <https://github.com/rrthomas/pdfjam-extras>.
+
+- Merge two PDFs into one with the default suffix "joined":
+
+`pdfjoin {{path/to/file1.pdf}} {{path/to/file2.pdf}}`
+
+- Merge the first page of each given file together:
+
+`pdfjoin {{path/to/file1.pdf path/to/file2.pdf ...}} {{1}} --outfile {{output_file}}`
+
+- Save pages 3 to 5 followed by page 1 to a new PDF with custom suffix:
+
+`pdfjoin {{path/to/file.pdf}} {{3-5,1}} --suffix {{rearranged}}`
+
+- Merge page subranges from two PDFs:
+
+`pdfjoin {/path/to/file1.pdf}} {{2-}} {{file2}} {{last-3}} --outfile {{output_file}}`