Control and drivers docs

[jcrozum]

Documentation for the control module. Also some updates to the doc generation to fix small errors and clean up the docs website.

Finally, I changed the way Intervention objects are compared. Previously, we drew a very confusing distinction between equivalence and equality that no one is going to care about. I removed the is_equivalent function and made the equality function a bit more clear.

Note that this branch was derived from #100, so I will close that PR in favor of this one.

[jcrozum]

Forgot to mention I added short doc strings for type aliases because they are heavily used in the control module.

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
balm
control.py	114	14	88%	102, 114, 120, 124, 129, 138–154, 472, 475, 488
interaction_graph_utils.py	54	5	91%	6–8, 47, 165–166
motif_avoidant.py	152	2	99%	25, 121
petri_net_translation.py	148	11	93%	18–22, 58, 94, 207–208, 232–233, 242, 346
space_utils.py	129	4	97%	25–27, 252, 278
succession_diagram.py	247	12	95%	6, 163, 177, 185, 188, 205–206, 312, 439, 627, 665, 700
symbolic_utils.py	26	3	88%	10–12, 44
trappist_core.py	183	30	84%	11–15, 45, 47, 82, 129, 195, 197, 199, 227–230, 234–236, 256–262, 320, 322, 352, 392, 394, 425, 454
balm/_sd_algorithms
compute_attractor_seeds.py	30	1	97%	8
expand_attractor_seeds.py	51	5	90%	6, 42, 97–102
expand_bfs.py	28	1	96%	6
expand_dfs.py	30	1	97%	6
expand_minimal_spaces.py	37	2	95%	6, 31
expand_source_SCCs.py	164	6	96%	19–21, 91, 101, 143, 287
expand_to_target.py	31	3	90%	6, 38, 43
TOTAL	1469	100	93%

Tests	Skipped	Failures	Errors	Time
363	0 :zzz:	0 :x:	0 :fire:	1m 2s :stopwatch:

[jcrozum]

We've already discussed most of the changes and the rest should be inoffensive. The tests are passing, so I'm just going to merge this.