Fixed a null pointer bug effecting the peg operations.

* main:
  Chore(deps-dev): Bump @vitest/coverage-c8 from 0.28.2 to 0.28.5 (#15)
  Chore(deps): Bump vite-plugin-wasm from 3.1.1 to 3.2.1 (#16)
  Chore(deps-dev): Bump vitest from 0.25.8 to 0.28.5 (#17)
  Chore(deps-dev): Bump prettier from 2.8.3 to 2.8.4 (#18)
  Chore(deps-dev): Bump @esbuild-plugins/node-modules-polyfill (#14)

…is broke the tests - needs to be 'testnet'

…sbtc-bridge-api

* feat/12-remove-multi-environment-support:
  Issue with the tests - i changed the network in .env to devnet and this broke the tests - needs to be 'testnet'
  Chore: tidied env vars.
  Enforced single network for the code depending on environment variables. Fixed a null pointer bug effecting the peg operations.

# Conflicts:
#	.env
#	.env.production
#	src/lib/psbt.ts
#	tests/helper.ts
#	tests/psbt.test.ts

…PIs (mempool, blockcypher, stacks node). The bridge_api reduces the API dependencies to just the new bridge-api.

This is WIP as it depends on working API.

…he bridge-api now provides a single interface for nested rest calls and error handling.

* main:
  Chore(deps-dev): Bump typescript from 4.9.4 to 4.9.5 (#22)
  Chore(deps-dev): Bump vite from 4.0.4 to 4.1.4 (#23)
  Chore(deps-dev): Bump vitest from 0.28.5 to 0.29.1 (#25)
  Chore(deps-dev): Bump @sveltejs/kit from 1.8.7 to 1.9.1 (#27)
  Chore(deps-dev): Bump @sveltejs/adapter-static from 1.0.4 to 2.0.1 (#26)