Move pages back into a "pages" folder

pages/common/gzip.md

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+# gzip
+
+> Compress/uncompress files with gzip compression (LZ77)   
+
+- compress a file, replacing it with a gzipped compressed version
+
+`gzip {{file.ext}}`
+
+- decompress a file, replacing it with the original uncomrpessed version
+
+`gzip -d {{file.ext.gz}}`
+
+- compress a file specifying the output filename
+
+`gzip -c {{file.ext}} > compressed-file.ext.gz`
+
+- uncompress a gzipped file specifying the output filename
+
+`gzip -c -d {{file.ext.gz}} > uncompressed-file.ext`
+
+- specify the compression level. 1=Fastest (Worst), 9=Slowest (Best), Default level is 6
+
+`gzip -9 -c {{file.ext}} > compressed-file.ext.gz`