Update cheatsheets

ghc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ghc
+
+> The Glasgow Haskell Compiler.
+> Compiles and links Haskell source files.
+> More information: <https://www.haskell.org/ghc>.
+
+- Find and compile all modules in the current directory:
+
+`ghc Main`
+
+- Compile a single file:
+
+`ghc {{path/to/file.hs}}`
+
+- Compile using extra optimization:
+
+`ghc -O {{path/to/file.hs}}`
+
+- Stop compilation after generating object files (.o):
+
+`ghc -c {{path/to/file.hs}}`
+
+- Start a REPL (interactive shell):
+
+`ghci`
+
+- Evaluate a single expression:
+
+`ghc -e {{expression}}`