Update bootstrap to 4.5.0, jquery to 3.5.1

[dcslagel]

Description

This pull-request updates docs/demo.html to use Bootstrap 4.5.0 and Jquery slim 3.5.1. Previously demo.html was using an alpha level version of bootstrap (4.0.0-alpha.6).

Demo.html was using the cdn install of Bootstrap so this update continues to use the recommended cdn. The install instructions are found here: https://getbootstrap.com/docs/4.5/getting-started/introduction/

Related Issue

Resolves #105 Update demo.html's bootstrap4 to the current release 4.5.0.

Motivation and Context

Move from an alpha Bootstrap version to a production level version.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

Test results:

npm test
PASS dist/test/log_templates.test.js
  ✓ default log curve template name is a property (5 ms)
  ✓ test define data function (1 ms)
  ✓ test define curve and data function

PASS dist/test/track_template.test.js
  ✓ default track name is a property (2 ms)
  ✓ add curve works (1 ms)

PASS dist/test/well_section_template.test.js
  ✓ default well section template is a property (2 ms)

PASS dist/test/well_log_template.test.js
  ✓ default well log name is a property (3 ms)

PASS dist/test/curve_fill_template.test.js
  ✓ default fill curve template curve_name is a property (2 ms)

PASS dist/test/triple_combo.test.js
  ✓ default track name is a property (3 ms)
  ✓ load a log into triple combo template (12 ms)

Test Suites: 6 passed, 6 total
Tests:       10 passed, 10 total
Snapshots:   0 total
Time:        3.887 s
Ran all test suites.