(Feature) Make title of the page configurable

[gabitoesmiapodo]

Closes #199

New parameter REACT_APP_TITLE in .env describing the rules for title generation:

Given REACT_APP_TITLE=Bridge UI dApp - %c in .env

• If %c is specified and we are connected to - for example- POA Network, the result is Bridge UI dApp - POA Network

• If %c is omitted, the result is Bridge UI dApp

• If the template is specified but the network is not chosen, the result is Bridge UI dApp - No chain specified

[netlify[bot]]

Deploy preview for kind-kilby-95344f processing.

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[patitonar]

Also Closes #134

[coveralls]

Pull Request Test Coverage Report for Build 421

• 0 of 11 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 10.292%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/stores/utils/web3.js	0	11	0.0%
<!--	Total:	0	11	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
src/stores/utils/web3.js	1	0.0%
<!--	Total:	1		-->

Totals
Change from base Build 414:	-0.3%
Covered Lines:	48
Relevant Lines:	445

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💛 - Coveralls