Fst-runtime

Also with this release was a lot of testing of the github workflow file to automate github pages deployment as well during release publication. This version is really v0.2.0 because I really messed up the versioning when testing this workflow file. Regardless, now that that is complete, this should essentially be the final state of this project for the foreseeable future, and so releasing it under a v0.2 instead of v0.1 is also fitting.

- adds the original input string that led to the resulting output string in the `FstOutput` class
- simplifies tag permutation logic

Implements functionality for reading in a weighted or unweighted FST from a `.att` file and traversing over it.