update documentation

[atharvas]

Need to merge this commit after Arxiv version is public, and all pkg metrics are up. Necessary before releasing v0.1.0.

• Update README with updated Arxiv paper.
• Update CITATIONS
• Update CI and github actions.

[github-actions]

Benchmark Results

	master	9e017c2...	master/9e017c286911e1...
search/multithreading	20.2 ± 0.29 s	19.1 ± 0.33 s	1.06
search/serial	28.3 ± 0.16 s	28.2 ± 0.23 s	1
utils/best_of_sample	0.912 ± 0.35 μs	0.962 ± 0.37 μs	0.948
utils/check_constraints_x10	11.7 ± 3 μs	11.7 ± 3 μs	1.01
utils/compute_complexity_x10/Float64	2.07 ± 0.11 μs	2.09 ± 0.11 μs	0.99
utils/compute_complexity_x10/Int64	2.01 ± 0.11 μs	2.01 ± 0.11 μs	1
utils/compute_complexity_x10/nothing	1.45 ± 0.091 μs	1.46 ± 0.11 μs	0.993
utils/optimize_constants_x10	31.5 ± 7.3 ms	31 ± 7 ms	1.02
time_to_load	1.75 ± 0.015 s	1.76 ± 0.026 s	0.997

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).