Replace hyperlinks with BibTeX references

[tsalo]

Changes proposed in this pull request

• Remove reconstruction copy.rst.
• Replace citing.rst with sphinxcontrib-bibtex citations.
• Add necessary citations to boilerplate.bib.
• Remove unused requirements.txt file.

[tsalo]

I rendered the docs locally and they look good.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (main@6fde41c). Learn more about missing BASE report.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #67 +/- ## ======================================= Coverage ? 33.75% ======================================= Files ? 56 Lines ? 6852 Branches ? 892 ======================================= Hits ? 2313 Misses ? 4438 Partials ? 101 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.