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

tldr/assimp

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# assimp
+
+> Command-line client for the Open Asset Import Library.
+> Supports loading of 40+ 3D file formats, and exporting to several popular 3D formats.
+> More information: <https://assimp-docs.readthedocs.io/>.
+
+- List all supported import formats:
+
+`assimp listext`
+
+- List all supported export formats:
+
+`assimp listexport`
+
+- Convert a file to one of the supported output formats, using the default parameters:
+
+`assimp export {{input_file.stl}} {{output_file.obj}}`
+
+- Convert a file using custom parameters (the dox_cmd.h file in assimp's source code lists available parameters):
+
+`assimp export {{input_file.stl}} {{output_file.obj}} {{parameters}}`
+
+- Display a summary of a 3D file's contents:
+
+`assimp info {{path/to/file}}`
+
+- Display help:
+
+`assimp help`
+
+- Display help for a specific subcommand:
+
+`assimp {{subcommand}} --help`