Make logo visible in GitHub App (#582)

* Fix naming

* Make logo visible in dark mode

* Close div correctly

* Add glow version of logo

* Tune height

* Bring centering back

* Revert "Bring centering back"

This reverts commit ab05c59.

* Revert "Close div correctly"

This reverts commit 38a7925.

README.md

@@ -1,5 +1,5 @@
 <div align="center">
-<img src="./.images/ink-logo.svg" alt="ink!" height="120" />
+    <img src="./.images/ink-logo-glow.svg" alt="ink!" height="136" />
 <h1 align="center">
     Parity's ink! for writing smart contracts
 </h1>
@@ -27,7 +27,7 @@
 [l1]: https://img.shields.io/discord/722223075629727774?style=flat-square&label=discord
 [l2]: https://discord.gg/ztCASQE
 
-> <img src="./.images/ink-squid.svg" alt="squid, the ink! mascot" style="vertical-align: middle" align="left" height="60" />ink! is an [eDSL](https://wiki.haskell.org/Embedded_domain_specific_language) to write WebAssembly based smart contracts using the Rust programming language. The compilation target are blockchains built on the [Substrate](https://github.com/paritytech/substrate) framework.
+> <img src="./.images/ink-squid.svg" alt="squink, the ink! mascot" style="vertical-align: middle" align="left" height="60" />ink! is an [eDSL](https://wiki.haskell.org/Embedded_domain_specific_language) to write WebAssembly based smart contracts using the Rust programming language. The compilation target are blockchains built on the [Substrate](https://github.com/paritytech/substrate) framework.
 
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