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

tldr/in2csv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# in2csv
+
+> Converts various tabular data formats into CSV.
+> Included in csvkit.
+> More information: <https://csvkit.readthedocs.io/en/latest/scripts/in2csv.html>.
+
+- Convert an XLS file to CSV:
+
+`in2csv {{data.xls}}`
+
+- Convert a DBF file to a CSV file:
+
+`in2csv {{data.dbf}} > {{data.csv}}`
+
+- Convert a specific sheet from an XLSX file to CSV:
+
+`in2csv --sheet={{sheet_name}} {{data.xlsx}}`
+
+- Pipe a JSON file to in2csv:
+
+`cat {{data.json}} | in2csv -f json > {{data.csv}}`