feat(plugins): adding server documentation for plugins

[str-anger]

This pull request addresses documentation of plugin creation and installation and finalises necessary changes for plugin installation.

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
aqueductcore/backend
context.py	33	4	88%	48–52, 59–60
main.py	19	4	79%	21–24, 31
session.py	13	4	69%	24–28
aqueductcore/backend/models
extensions.py	151	14	91%	53, 56, 80–81, 88, 94, 96–97, 175, 217, 221, 246, 252, 260
orm.py	31	1	97%	58
aqueductcore/backend/routers
files.py	88	2	98%	165–166
frontend.py	24	11	54%	22–33, 37
aqueductcore/backend/routers/graphql
mutations_schema.py	57	2	96%	44, 130
query_schema.py	45	2	96%	66–68
router.py	11	1	91%	15
aqueductcore/backend/routers/graphql/mutations
experiment_mutations.py	24	1	96%	30
aqueductcore/backend/routers/graphql/resolvers
experiment_resolver.py	25	2	92%	28, 36
tags_resolver.py	25	3	88%	14, 44, 46
aqueductcore/backend/services
experiment.py	220	32	85%	82, 111–124, 154, 188, 194, 240, 243, 268, 299, 348, 354, 383, 389, 406, 431, 438, 446, 476–482, 489–493, 505–508
extensions_executor.py	88	11	88%	40–42, 48–49, 64, 79, 82, 103, 148–154, 204
validators.py	33	2	94%	41, 46
TOTAL	1117	96	91%

Tests	Skipped	Failures	Errors	Time
92	1 :zzz:	0 :x:	0 :fire:	24.695s :stopwatch:

[samiralavi]

Could you please merge main into your branch to have the docs preview feature for this PR?