Improve manifest metadata

Mirror the metadata in `rust-bitcoin` by:

- Updating the 'repository' entry to the `rust-bitcoin` github org
- Adding a 'homepage' entry
- Add a 'keywords' entry (use the cringy 'crypto' keyword)
- Add a 'readme' entry
- Order the entries as is done in `rust-bitcoin` for uniformity

Author: tcharding

Cargo.toml

@@ -2,9 +2,12 @@
 name = "miniscript"
 version = "7.0.0"
 authors = ["Andrew Poelstra <[email protected]>, Sanket Kanjalkar <[email protected]>"]
-repository = "https://github.com/apoelstra/miniscript"
-description = "Miniscript: a subset of Bitcoin Script designed for analysis"
 license = "CC0-1.0"
+homepage = "https://github.com/rust-bitcoin/rust-miniscript/"
+repository = "https://github.com/rust-bitcoin/rust-miniscript/"
+description = "Miniscript: a subset of Bitcoin Script designed for analysis"
+keywords = [ "crypto", "bitcoin"]
+readme = "README.md"
 
 [features]
 compiler = []