Cityseer

- Adds a function for converting `OSMnx` `multiDiGraph` to `cityseer` compatible `MultiGraph`.
- Adds docs providing context on comparison to `OSMnx` and other graph packages.

Bumps version to v1.0.0 so that pre v1 versions are not installed by default via Pip.

v1 alpha release

This release includes significant changes including several breaking changes.

Given that the repo is still in alpha / beta development stages these changes won't be discussed here in depth, except to note that:
- The graph cleaning methods have been substantially overhauled. The consolidation methods have changed substantially; see the documentation for examples of how to use the new methods.
- The documentation system has been upgraded: the latest version includes a python `docstring` parser that builds the markdown from the source code. The static site generator has been migrated from `vuepress` to `vitepress`.

The latest version is named for `v1` (alpha) indicating that the intent is now to stabilise development going forward.

Breaking change:
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The `compute_centrality` method has been split into two: `compute_node_centrality` and `compute_segment_centrality`. This release incorporates some abstractions pertaining to numba JIT compiled functions and improves angular and segmentised methods.

Reverts node betweenness to old behaviour (does not skip ghosted nodes for decomposed graphs).