build: Adopt React Native 0.61 and Unlink manual-linked-libraries (#557)

* fix path

* merge master branch

* build: update polkadot dependencies and remove redundant packages

* update kusama metadata to latest

* fix tests

* update react native

* stash

* unlink libraries

* unlink libraries

* Delete RNSecureStorage.podspec

* Update README.md

* Update README.md
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