General cleanup for the docs

Cargo.toml

@@ -83,3 +83,10 @@ required-features = ["cli-utils"]
 
 [workspace]
 members = ["macros", "testutils", "testutils-macros"]
+
+# Generate docs with nightly to add the "features required" badge
+# https://stackoverflow.com/questions/61417452/how-to-get-a-feature-requirement-tag-in-the-documentation-generated-by-cargo-do
+[package.metadata.docs.rs]
+features = ["compiler", "electrum", "esplora", "compact_filters", "key-value-db"]
+# defines the configuration attribute `docsrs`
+rustdoc-args = ["--cfg", "docsrs"]