Update cheatsheets

tldr/sfdk

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sfdk
+
+> The command line frontend of the Sailfish SDK.
+> More information: <https://docs.sailfishos.org/Tools/Sailfish_SDK/Installation/>.
+
+- Execute a subcommand:
+
+`sfdk {{subcommand}}`
+
+- Execute a subcommand on a custom working directory:
+
+`git -C {{path/to/directory}} {{subcommand}}`
+
+- Execute a subcommand with a given configuration set:
+
+`git -c '{{name}}={{value}}' {{subcommand}}`
+
+- Display help:
+
+`sfdk --help`
+
+- Display help for specific topic (`building`, `testing`, `maintaining`, `ide`, `all`):
+
+`sfdk --help-{{topic}}`
+
+- Display version:
+
+`sfdk --version`