Add link to the Vue 2 demo on GH to the integration-with-vue docs page

[sequba]

Context

Add link to the Vue 2 demo on GH to the integration-with-vue docs page

How did you test your changes?

local docs build

Types of changes

• [ ] Breaking change (a fix or a feature because of which an existing functionality doesn't work as expected anymore)
• [ ] New feature or improvement (a non-breaking change that adds functionality)
• [ ] Bug fix (a non-breaking change that fixes an issue)
• [ ] Additional language file, or a change to an existing language file (translations)
• [x] Change to the documentation

Related issues:

• 1275

• 1355

• https://handsoncode.slack.com/archives/C4PV4S33Q/p1702899238389759 (internal discussion)

Checklist:

• [x] I have reviewed the guidelines about Contributing to HyperFormula and I confirm that my code follows the code style of this project.
• [ ] I have signed the Contributor License Agreement.
• [x] My change is compliant with the OpenDocument standard.
• [x] My change is compatible with Microsoft Excel.
• [x] My change is compatible with Google Sheets.
• [ ] I described my changes in the CHANGELOG.md file.
• [ ] My changes require a documentation update.
• [ ] My changes require a migration guide.

[github-actions[bot]]

Performance comparison of head (970e9bf0462eb5a1300dbfe8e8f4e293c599c839) vs base (1f94bb18ce6e8926ed23438f4d2c2be2f4e48563)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A | 539.38 | 552.25 | +2.39%
                                      Sheet B | 179.37 | 178.66 | -0.40%
                                      Sheet T |    157 | 156.44 | -0.36%
                                Column ranges | 561.07 |  571.6 | +1.88%
Sheet A:  change value, add/remove row/column |     41 |     45 | +9.76%
 Sheet B: change value, add/remove row/column |    325 |    311 | -4.31%
                   Column ranges - add column |    157 |    165 | +5.10%
                Column ranges - without batch |    636 |    631 | -0.79%
                        Column ranges - batch |     96 |     97 | +1.04%