Update jQuery on website

[TOsmanov]

Motivation and context

This PR updates jQuery on the site. To do this, the head.html template moved to the repository and replaced the link to jQuery (line 26)

How has this been tested?

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues (read github docs)
• I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT

[bsekachev]

@TOsmanov

Generally, why do we need to update jquery?

[TOsmanov]

@TOsmanov

Generally, why do we need to update jquery?

@bsekachev

This related with openvinotoolkit/datumaro#420 (comment). For example on CVAT documentation site because of this issue didn't work search.