Update README.md broken links

[filchristou]

the docs links were still broken in the README

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c28f187) 45.98% compared to head (be98bca) 45.98%.

:exclamation: Current head be98bca differs from pull request most recent head fccfc4b. Consider uploading reports for the commit fccfc4b to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #257 +/- ## ======================================= Coverage 45.98% 45.98% ======================================= Files 43 43 Lines 1344 1344 ======================================= Hits 618 618 Misses 726 726 ```

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[github-actions[bot]]

Package name	latest	stable
Mitosis.jl
Soss.jl

[gaurav-arya]

@cscherrer friendly bump:)

[cscherrer]

Thanks @filchristou , and thanks @gaurav-arya for the bump :)

[github-actions[bot]]

Package name	latest	stable
Mitosis.jl
Soss.jl