Issue/21/bpz note

[OliviaLynn]

Change Description

To close #21 (removing bpz special installation instructions)

• [x] My PR includes a link to the issue that I am addressing

Solution Description

Removes documentation describing now-deprecated install instructions for rail and bpz (path issues when one but not both are installed from source)

Code Quality

• [x] I have read the Contribution Guide
• [x] My code follows the code style of this project
• [x] My code builds (or compiles) cleanly without any errors or warnings
• [x] My code contains relevant comments and necessary documentation

Project-Specific Pull Request Checklists

Documentation Change Checklist

• [x] Any updated docstrings use the NumPy docstring format

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +22.65 :tada:

Comparison is base (3dd752d) 77.34% compared to head (0175b14) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #40 +/- ## ============================================ + Coverage 77.34% 100.00% +22.65% ============================================ Files 3 1 -2 Lines 128 1 -127 ============================================ - Hits 99 1 -98 + Misses 29 0 -29 ```

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