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

tldr/spctoppm

@@ -0,0 +1,13 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# spctoppm
+
+> Convert an Atari compressed Spectrum image to a PPM image.
+> More information: <https://netpbm.sourceforge.net/doc/spctoppm.html>.
+
+- Convert an SPC file to a PPM image:
+
+`spctoppm {{path/to/input.spc}} > {{path/to/output.ppm}}`