Add support for Gophermap and Gemini markdown files

gemini.nanorc

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+## syntax highlighting for gemini:// markup language
+
+syntax gemini "\.(gemini|gmi)$"
+
+# Heading levels
+color brightgreen "^#.*"
+color brightcyan "^##.*"
+color brightmagenta "^###.*"
+
+# Link Text
+color brightred "^=>\s*\S+\s+.*"
+# Link URL
+color green "^=>\s*\S+"
+# Link Prefix
+color yellow "^=>"
+
+# Bullet Lists
+color brightblue "^\*.*"
+
+# Monospaced Blocks
+color white,black start="^```" end="^```"

gophermap.nanorc

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+## syntax for gophernicus gophermaps
+
+syntax gophermap "\.(gophermap|gph)$"
+
+
+# Port Numbers
+color yellow "^.[ -~]*.[ -~]*.[ -~]*.[ -~]+"
+
+# Domains
+color red "^.[ -~]*.[ -~]*.[ -~]+"
+
+# Resource Path (no directories)
+color green "^[^1][ -~]*.[ -~]*"
+
+# Directories (w/ Name)
+color brightmagenta "^1[ -~]*.[ -~]*"
+
+# Names
+color brightblue "^[ -~]+."
+
+# Directories (w/o Name)
+color brightyellow "^1[ -~]+.$"
+
+# URLs
+color brightcyan "URL:.*"
+
+
+# Types
+
+# General
+color magenta "^."
+
+# HTML & Interactive Content
+color brightcyan "^(h|7|8)"
+
+# Info Text
+color cyan "^i.*"
+color cyan "^[ -~]*$"
+color blue "^i"
+
+# Special Tags & Characters
+color brightgreen "^(!|-|:|~|%|=|\*|\.).*"
+
+# Comments
+color white,blue "#.*"