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

tldr/subfinder

@@ -0,0 +1,30 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# subfinder
+
+> Discover valid subdomains for websites.
+> Designed as a passive framework to be useful for bug bounties and safe for penetration testing.
+> More information: <https://github.com/projectdiscovery/subfinder>.
+
+- Find subdomains for a specific [d]omain:
+
+`subfinder -d {{example.com}}`
+
+- Show only the subdomains found:
+
+`subfinder --silent -d {{example.com}}`
+
+- Use a brute-force attack to find subdomains:
+
+`subfinder -d {{example.com}} -b`
+
+- Remove wildcard subdomains:
+
+`subfinder -nW -d {{example.com}}`
+
+- Use a given comma-separated list of [r]esolvers:
+
+`subfinder -r {{8.8.8.8,1.1.1.1,...}} -d {{example.com}}`