Advanced documentation for transactions

Documentation is an essential part when choosing to use a library. The documentation for the most important part TxBuilder is already finished. Now the time has come to document the tools for advanced users:

- [ ] Entry Page
- [x] Account
- [ ] Addresses
- [ ] DefiTx
- [ ] Raw Transactions
- [ ] Remote Data Source
- [ ] Keys
- [ ] Utils
- [ ] Exceptions