Vue 3 demo

[sequba]

Context

This PR adds a new page to the documentation with the Vue 3 demo. The existing Vue demo is renamed to Vue 2 demo.

Should be merged together with https://github.com/handsontable/hyperformula-demos/pull/20

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:

Fixes #1275

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 (bd27bab4bdd9e0ed1e6822886d2a8c405f890237) vs base (0661cdb2174af758d2436d14b1ad707aa0e2d249)

                                     testName |   base |   head |  change
-------------------------------------------------------------------------
                                      Sheet A |  755.8 |  751.4 |  -0.58%
                                      Sheet B | 254.06 | 260.29 |  +2.45%
                                      Sheet T |  224.2 | 226.45 |  +1.00%
                                Column ranges | 820.89 | 831.01 |  +1.23%
Sheet A:  change value, add/remove row/column |     60 |     53 | -11.67%
 Sheet B: change value, add/remove row/column |    420 |    412 |  -1.90%
                   Column ranges - add column |    429 |    234 | -45.45%
                Column ranges - without batch |    707 |    572 | -19.09%
                        Column ranges - batch |    152 |    184 | +21.05%

[codecov[bot]]

Codecov Report

Merging #1318 (bd27bab) into develop (0661cdb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1318   +/-   ##
========================================
  Coverage    97.27%   97.27%           
========================================
  Files          169      169           
  Lines        14420    14420           
  Branches      3080     3017   -63     
========================================
  Hits         14027    14027           
- Misses         388      393    +5     
+ Partials         5        0    -5     

see 3 files with indirect coverage changes