docs(guide): update support page (HF-128)

[GreenFlux]

Context

Updates the Support guide page (docs/guide/support.md) to match the new support content defined in HF-128.

Changes:

• Community support now points developers to the community forum for questions/feature requests and to the bug report issue template for bugs.
• Premium support describes the three support tiers (Standard, Priority, Enterprise) in a comparison table, with a link to the full plan details.
• Consulting services section retained.

How did you test your changes?

Documentation-only change. Verified the referenced bug_report.yaml issue template exists in .github/ISSUE_TEMPLATE/ and kept the internal "Contact sales" link in the existing relative contact.md form.

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)
• Change to the documentation

Related issues:

1. HF-128

Checklist:

• I have reviewed the guidelines about Contributing to HyperFormula and I confirm that my code follows the code style of this project.
• My changes require a documentation update.

🤖 Generated with Claude Code

---

Note

Low Risk
Documentation-only navigation and link changes with no runtime or API impact.

Overview
Removes the in-docs Support guide (docs/guide/support.md) and drops it from the VuePress About sidebar in docs/.vuepress/config.js.

Support CTAs now go off-site: the “Looking for technical support?” section in contact.md and the support link at the end of quality.md no longer point to support.md; they link to https://hyperformula.handsontable.com/#pricing instead.

^{Reviewed by Cursor Bugbot for commit 8dc15dd. Bugbot is set up for automated code reviews on this repo. Configure here.}

[qunabu]

Task linked: HF-128 Add Information about the support plans to HF docs

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[github-actions]

Performance comparison of head (8dc15dd) vs base (fd04f77)

                                     testName |    base |    head | change
--------------------------------------------------------------------------
                                      Sheet A |   501.2 |  509.49 | +1.65%
                                      Sheet B |  159.49 |  174.11 | +9.17%
                                      Sheet T |  142.17 |  150.22 | +5.66%
                                Column ranges |  471.51 |  496.34 | +5.27%
                                Sorted lookup | 15405.2 | 14890.6 | -3.34%
Sheet A:  change value, add/remove row/column |   15.93 |   16.84 | +5.71%
 Sheet B: change value, add/remove row/column |  144.08 |  141.06 | -2.10%
                   Column ranges - add column |  156.71 |  154.06 | -1.69%
                Column ranges - without batch |  474.39 |   472.8 | -0.34%
                        Column ranges - batch |  117.91 |  118.54 | +0.53%

[GreenFlux]

preview of new support page:
https://deploy-preview-1712--hyperformula-dev-docs.netlify.app/docs/guide/support.html

@sequba -ready for review.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.17%. Comparing base (fd04f77) to head (8dc15dd).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1712   +/-   ##
========================================
  Coverage    97.17%   97.17%           
========================================
  Files          176      176           
  Lines        15483    15483           
  Branches      3429     3429           
========================================
  Hits         15045    15045           
  Misses         438      438           

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