Integrate wallet connect (#2)

* Configure stack navigation to display header

* Use wallet connect to connect with dApps

* Replace react-native alerts with js alerts

* Add example env file

* Remove unnecessary code

* Make UI changes

* Uncomment required code

* Remove unnecessary dependencies

* Remove any type

* Fix indentation

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Co-authored-by: Shreerang Kale <shreerangkale@gmail.com>
Co-authored-by: Nabarun <nabarun@deepstacksoft.com>

.env.example

@@ -0,0 +1,4 @@
+REACT_APP_WALLET_CONNECT_PROJECT_ID=
+REACT_APP_DEFAULT_GAS_PRICE=0.025
+# Reference: https://github.com/cosmos/cosmos-sdk/issues/16020
+REACT_APP_GAS_ADJUSTMENT=2