Add coil objectives to docs

[f0uriest]

Adds new objectives for coil optimization to public docs.

Also fixes some minor formatting issues.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.24%. Comparing base (ac10970) to head (c0826dd).
Report is 1982 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1125   +/-   ##
=======================================
  Coverage   95.24%   95.24%           
=======================================
  Files          87       87           
  Lines       21659    21659           
=======================================
  Hits        20630    20630           
  Misses       1029     1029           

Files with missing lines	Coverage Δ
desc/coils.py	97.06% <100.00%> (ø)
desc/objectives/__init__.py	100.00% <ø> (ø)
desc/objectives/_coils.py	99.13% <100.00%> (ø)

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |     -2.85 +/- 5.55     | -1.54e-02 +/- 3.00e-02 |  5.25e-01 +/- 1.5e-02  |  5.41e-01 +/- 2.6e-02  |
 test_build_transform_fft_midres         |     -1.86 +/- 2.93     | -1.14e-02 +/- 1.81e-02 |  6.05e-01 +/- 7.8e-03  |  6.16e-01 +/- 1.6e-02  |
 test_build_transform_fft_highres        |     -0.15 +/- 4.02     | -1.53e-03 +/- 4.04e-02 |  1.00e+00 +/- 3.5e-02  |  1.00e+00 +/- 2.0e-02  |
 test_equilibrium_init_lowres            |     +1.10 +/- 3.83     | +4.15e-02 +/- 1.45e-01 |  3.81e+00 +/- 1.3e-01  |  3.77e+00 +/- 5.9e-02  |
 test_equilibrium_init_medres            |     +0.10 +/- 3.48     | +4.43e-03 +/- 1.49e-01 |  4.28e+00 +/- 1.0e-01  |  4.27e+00 +/- 1.1e-01  |
 test_equilibrium_init_highres           |     -0.24 +/- 1.83     | -1.33e-02 +/- 1.04e-01 |  5.65e+00 +/- 5.2e-02  |  5.67e+00 +/- 9.0e-02  |
 test_objective_compile_dshape_current   |     -5.46 +/- 3.09     | -2.22e-01 +/- 1.25e-01 |  3.84e+00 +/- 6.6e-02  |  4.06e+00 +/- 1.1e-01  |
 test_objective_compile_atf              |     -5.08 +/- 3.36     | -4.46e-01 +/- 2.94e-01 |  8.32e+00 +/- 1.8e-01  |  8.77e+00 +/- 2.3e-01  |
 test_objective_compute_dshape_current   |     +2.25 +/- 6.16     | +2.83e-05 +/- 7.77e-05 |  1.29e-03 +/- 5.5e-05  |  1.26e-03 +/- 5.5e-05  |
 test_objective_compute_atf              |    -12.76 +/- 6.86     | -6.40e-04 +/- 3.44e-04 |  4.37e-03 +/- 1.6e-04  |  5.01e-03 +/- 3.0e-04  |
 test_objective_jac_dshape_current       |     -4.48 +/- 7.72     | -1.76e-03 +/- 3.03e-03 |  3.75e-02 +/- 2.0e-03  |  3.93e-02 +/- 2.2e-03  |
 test_objective_jac_atf                  |     -0.98 +/- 3.94     | -1.87e-02 +/- 7.48e-02 |  1.88e+00 +/- 3.1e-02  |  1.90e+00 +/- 6.8e-02  |
 test_perturb_1                          |     -6.71 +/- 2.50     | -9.80e-01 +/- 3.65e-01 |  1.36e+01 +/- 1.8e-01  |  1.46e+01 +/- 3.2e-01  |
 test_perturb_2                          |     -7.11 +/- 3.88     | -1.41e+00 +/- 7.70e-01 |  1.84e+01 +/- 2.5e-01  |  1.99e+01 +/- 7.3e-01  |
 test_proximal_jac_atf                   |     -0.12 +/- 1.08     | -8.89e-03 +/- 8.01e-02 |  7.39e+00 +/- 5.5e-02  |  7.39e+00 +/- 5.9e-02  |
 test_proximal_freeb_compute             |     -0.18 +/- 1.25     | -3.26e-04 +/- 2.24e-03 |  1.79e-01 +/- 1.6e-03  |  1.79e-01 +/- 1.6e-03  |
 test_proximal_freeb_jac                 |     -0.57 +/- 1.29     | -4.22e-02 +/- 9.61e-02 |  7.42e+00 +/- 6.4e-02  |  7.46e+00 +/- 7.2e-02  |
 test_solve_fixed_iter                   |     +0.81 +/- 9.00     | +1.22e-01 +/- 1.35e+00 |  1.52e+01 +/- 7.5e-01  |  1.50e+01 +/- 1.1e+00  |