Merge bitcoindevkit/bdk#1882: doc: remove 1.0 roadmap stuff and fix broken links...

Merge bitcoindevkit/bdk#1882: doc: remove 1.0 roadmap stuff and fix broken links from README

609f12c2cf9f439d94211a663b27c62bd0c6a550 doc: remove 1.0 roadmap stuff and fix broken links (Luis Schwab)

Pull request description:

  <!-- You can erase any parts of this template not applicable to your Pull Request. -->

  ### Description

  - Removed mentions of a future 1.0 release
  - Fixed broken links to example crates

  ### Checklists

  #### All Submissions:

  * [X] I've signed all my commits
  * [X] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [X] I ran `cargo fmt` and `cargo clippy` before committing

ACKs for top commit:
  thunderbiscuit:
    ACK 609f12c2cf9f439d94211a663b27c62bd0c6a550. 👍
  LagginTimes:
    ACK 609f12c2cf9f439d94211a663b27c62bd0c6a550
  ValuedMammal:
    ACK 609f12c2cf9f439d94211a663b27c62bd0c6a550

Tree-SHA512: d58ac289a8b3f2637115a7f31cb3f8f8bf902a98260f763e534e5feeab9421e5410b5c55b1d76166145f88bc4e521ab574b471dbe72ac2ac71fbd4860ef15a77