fix(security): remove old jquery

[adrienjoly]

contributes to #669.
to fix https://github.com/openwhyd/openwhyd/security/code-scanning/22

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
+1.18%	∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a1e259b)	5067	2950	58.22%
Head commit (f1220cc)	5093 (+26)	3025 (+75)	59.40% (+1.18%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#670)	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: <covered lines added or modified>/<coverable lines added or modified> * 100%

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