Co-authored-by: Agustín Borgna <121866228+aborgna-q@users.noreply.github.com>

This reverts commit 8be7b9c.

This is a patch release including only some non-breaking changes since
0.9.0.

## New release
* `hugr`: 0.9.0 -> 0.9.1
* `hugr-core`: 0.6.0 -> 0.6.1
* `hugr-passes`: 0.6.0 -> 0.6.1
* `hugr-cli`: 0.2.0 -> 0.2.1

<details><summary><i><b>Changelog</b></i></summary><p>

## `hugr`
<blockquote>

## 0.9.1 (2024-07-25)

### Bug Fixes

- Dfg wrapper build handles incorrect output wire numbers
([#1332](#1332))
- Sibling extension panics while computing signature with non-dataflow
nodes ([#1350](#1350))
</blockquote>

## `hugr-core`
<blockquote>

## 0.6.1 (2024-07-25)

### Bug Fixes

- Dfg wrapper build handles incorrect output wire numbers
([#1332](#1332))
- Sibling extension panics while computing signature with non-dataflow
nodes ([#1350](#1350))
</blockquote>

## `hugr-passes`
<blockquote>

## 0.6.1 (2024-07-25)

Nothing here.
</blockquote>

## `hugr-cli`
<blockquote>

## 0.2.1 (2024-07-25)

Nothing here.
</blockquote>


</p></details>

---
This PR was generated by a human.

---------

Co-authored-by: Seyon Sivarajah <seyon.sivarajah@quantinuum.com>

Updates the instructions to use `release-plz` locally. This is easier
and less error prone, since it can reuse the configuration used for
normal releases.

Closes #248 

There are still some visual glitches, but it should be more readable
now.

Adds two invisible order edges to the input nodes, changing this
```mermaid
flowchart
    subgraph CFG
        direction TB
        subgraph Entry
            direction TB
            EntryIn["Input"] -- "P" --> Entry_["P?1"]
            Entry_ -- "[()|(P)]" --> EntryOut["Output"]
            F
        end
        subgraph BB1
            direction TB
            BB1In["Input"]
            BB1_["Const"] -- "[()]" --> BB1Out["Output"]
            G -- "angle" --> BB1Out
        end
        subgraph BB2
            direction TB
            BB2In["Input"] -- "P" --> H -- "P" --> BB2_["P?2"]
            BB2_ -- "[()|()]" --> BB2Out["Output"]
        end
        subgraph BB3
            direction TB
            BB3In["Input"]
            BB3_["Const"] -- "[()]" --> BB3Out["Output"]
            C -- "angle" --> BB3Out
        end
        subgraph Exit
        end
        Entry -- "0" --> BB1
        Entry -- "1" --> BB2
        BB2 -- "0" --> BB1
        BB2 -- "1" --> BB3
        BB1 -- "0" --> Exit
        BB3 -- "0" --> Exit
    end
    A -- "P" --> CFG
    A -- "qubit" --> Rz_out["Rz"]
    CFG -- "angle" --> Rz_out
    Rz_out -- "qubit" --> B
    A == "angle" ==> F
    F == "angle" ==> G
    linkStyle 12,13,14,15,16,17 stroke:#ff3,stroke-width:4px;
```
into this
```mermaid
flowchart
    subgraph CFG
        direction TB
        subgraph Entry
            direction TB
            EntryIn["Input"] -- "P" --> Entry_["P?1"]
            Entry_ -- "[()|(P)]" --> EntryOut["Output"]
            F
        end
        subgraph BB1
            direction TB
            BB1In["Input"]
            BB1_["Const"] -- "[()]" --> BB1Out["Output"]
            G -- "angle" --> BB1Out
            BB1In ~~~ G
        end
        subgraph BB2
            direction TB
            BB2In["Input"] -- "P" --> H -- "P" --> BB2_["P?2"]
            BB2_ -- "[()|()]" --> BB2Out["Output"]
        end
        subgraph BB3
            direction TB
            BB3In["Input"]
            BB3_["Const"] -- "[()]" --> BB3Out["Output"]
            C -- "angle" --> BB3Out
            BB3In ~~~ C
        end
        subgraph Exit
        end
        Entry -- "0" --> BB1
        Entry -- "1" --> BB2
        BB2 -- "0" --> BB1
        BB2 -- "1" --> BB3
        BB1 -- "0" --> Exit
        BB3 -- "0" --> Exit
    end
    A -- "P" --> CFG
    A -- "qubit" --> Rz_out["Rz"]
    CFG -- "angle" --> Rz_out
    Rz_out -- "qubit" --> B
    A == "angle" ==> F
    F == "angle" ==> G
    linkStyle 12,13,14,15,16,17 stroke:#ff3,stroke-width:4px;
```

Since we are breaking serialisation I edited most test cases to use v3.
The single test case which I deleted was testing that we were able to l
deserialise from an older version, so is now redundant. This should have
been done when removing `CustomTypeArg`.

BREAKING CHANGE: All Hugrs serialised with earlier versions will fail to
deserialise

---------

Co-authored-by: Agustín Borgna <121866228+aborgna-q@users.noreply.github.com>
Co-authored-by: Seyon Sivarajah <seyon.sivarajah@quantinuum.com>