ocrmypdf: add page (#6259)

pages/common/ocrmypdf.md

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+# ocrmypdf
+
+> Generate a searchable PDF or PDF/A from a scanned PDF or an image of text.
+> More information: <https://ocrmypdf.readthedocs.io/en/latest/cookbook.html>.
+
+- Create a new searchable PDF/A file from a scanned PDF or image file:
+
+`ocrmypdf {{path/to/input_file}} {{path/to/output.pdf}}`
+
+- Replace a scanned PDF file with a searchable PDF file:
+
+`ocrmypdf {{path/to/input.pdf}}`
+
+- Skip pages of a mixed-format input PDF file that already contain text:
+
+`ocrmypdf --skip-text {{path/to/input.pdf}} {{path/to/output.pdf}}`
+
+- Clean, de-skew, and rotate pages of a poor scan:
+
+`ocrmypdf --clean --deskew --rotate-pages {{path/to/input_file}} {{path/to/output.pdf}}`
+
+- Set the metadata of the searchable PDF file:
+
+`ocrmypdf --title "{{title}}" --author "{{author}}" --subject "{{subject}}" --keywords "{{keyword; key phrase; ...}}" {{path/to/input_file}} {{path/to/output.pdf}}`
+
+- Display help:
+
+`ocrmypdf --help`