Release 0.1.0

[casey]

• document in readme and crate root docs: all delimiters, what they translate into, filename algorithm, axum feature
• link to crate documentation in readme
• document non-goals: helpers in crate, runtime dependencies, fallible templates
• whitespace trimming
• Make the axum implementation a separate macro?
• switch to quote?
• Allow %% and $$ to match end of string with no newline
• make the name less confusing: #[derive(Boilerplate)] and attr boilerplate.
• escape html
• compare to jinja, maud, tera, and askama
• publish to crates.io
• shill on r/rust
• shill on twitter