Added confirmation polling to transaction page.

[Randy808]

To run locally, npm install and use the following snippets:

# Bitcoin
export API_URL=https://blockstream.info/api
export PORT=4999
source flavors/blockstream/config.env
source flavors/bitcoin-mainnet/config.env
npm run dev-server

# Liquid
export API_URL=https://blockstream.info/liquid/api
export PORT=5000
source flavors/blockstream/config.env
source flavors/liquid-mainnet/config.env
npm run dev-server

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To test with an unconfirmed transaction:

• Navigate to an unconfirmed transaction on either Bitcoin or Liquid
• Await a new block
• If the unconfirmed transaction was included in the block, the page should transition to confirmed