New README header style

[repi]

Testing with a style tweak for our open source project READMEs to make them a bit cleaner and have a clear single-line description/tagline.

• Let's discuss in New README header style opensource-template#33 and have that merge first

[repi]

some unrelated CI failures, should we just manually merge?

[Jake-Shadle]

Updated deps due to openssl vulnerability.

    Updating crates.io index
      Adding arrayvec v0.5.2
    Updating bytes v1.0.1 -> v1.1.0
    Updating combine v4.6.0 -> v4.6.1
    Updating flate2 v1.0.20 -> v1.0.21
    Updating itoa v0.4.7 -> v0.4.8
    Updating jobserver v0.1.23 -> v0.1.24
    Updating libc v0.2.99 -> v0.2.101
    Updating memchr v2.4.0 -> v2.4.1
    Updating object v0.26.0 -> v0.26.2
    Updating openssl v0.10.35 -> v0.10.36
    Updating openssl-src v111.15.0+1.1.1k -> v111.16.0+1.1.1l
    Updating openssl-sys v0.9.65 -> v0.9.66
    Updating proc-macro2 v1.0.28 -> v1.0.29
    Updating rustc-demangle v0.1.20 -> v0.1.21
    Updating serde v1.0.127 -> v1.0.130
    Updating serde_derive v1.0.127 -> v1.0.130
    Updating serde_json v1.0.66 -> v1.0.67
    Updating strip-ansi-escapes v0.1.0 -> v0.1.1
    Updating structopt v0.3.22 -> v0.3.23
    Updating structopt-derive v0.4.15 -> v0.4.16
    Updating syn v1.0.74 -> v1.0.75
    Updating target-lexicon v0.12.1 -> v0.12.2
    Updating thiserror v1.0.26 -> v1.0.28
    Updating thiserror-impl v1.0.26 -> v1.0.28
    Updating utf8parse v0.1.1 -> v0.2.0
    Updating vte v0.3.3 -> v0.10.1
      Adding vte_generate_state_changes v0.1.1