Convert README to markdown + update git URLs

README.md

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+# The Manned.org Source Code
+
+This repository holds the source code of Manned.org. For a description of the
+site, check out [https://manned.org/info/about](https://manned.org/info/about).
+  
+Ironically, documentation about how things work is completely lacking.
+
+## Requirements
+
+- perl: A somewhat recent version (no idea which, due to my XS usage)
+- postgresql: Also a somewhat recent version
+- rust + cargo (1.13+)
+
+### Web front-end
+
+- DBI
+- DBD::Pg
+- TUWF
+- JSON::XS
+- AnyEvent
+
+### Man page indexer
+
+- curl
+- psql
+
+## File structure
+
+- **indexer/** -> The Rust program that scans package repositories for updates, fetches new packages and extracts the man pages.
+- **lib/ManUtils/** -> Perl/XS helper module to format man pages into HTML (uses **web/**).
+- **sql/** -> Database schema & updates.
+- **util/** -> Cron job and scripts to run **indexer/** on the right repositories.
+- **web/** -> Badly named Rust library to convert man pages into HTML.
+- **www/** -> The web front-end.