Remove requirements file

[liamhuber]

Ideally there should be a single source of truth -- since some things are available only on conda and not on pypi, we have 1.5 sources (pyproject.toml and environment.yml), but these still supersede requirements.txt.

I went through and removed every requirement that wasn't either (a) didn't appear directly anywhere in the project, or (b) was already in our other requirements lists. All that remained was atomistics. This module is used directly in pyiron_nodes.atomistic.property.elastic, so I added it to the dependencies. (We got away without explicitly requiring it since it came with pyiron_atomistics anyhow, but any package that is directly referenced should appear explicitly in the dependencies.)

[github-actions[bot]]

:point_left: Launch a binder notebook on branch _pyiron/pyironnodes/requirements

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (05ebe69e10f247de3a43d86749e8d05f4623c81d) | 1246 | 2 | 0.16% | | | Head commit (8521be4814860c4f729deea80937eb92cf78a5ad) | 1246 (+0) | 2 (+0) | 0.16% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#43) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[coveralls]

Pull Request Test Coverage Report for Build 10273738077

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.161%

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Totals
Change from base Build 10273316758:	0.0%
Covered Lines:	2
Relevant Lines:	1246

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💛 - Coveralls