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 edits to the support guide with no runtime or security impact.

Overview
Community support is rewritten to route questions and feature requests to the Handsontable community forum and bugs to GitHub using the bug_report.yaml issue template, instead of a single generic “create an issue” flow.

Premium support copy now describes Standard, Priority, and Enterprise in a comparison table (channels, code review hours, enterprise extras) and links to full plan details on the HyperFormula pricing page, replacing the shorter sales-oriented paragraph.

Consulting services keeps the same bullet list and Contact sales link; only minor wording/formatting is tightened.

^{Reviewed by Cursor Bugbot for commit 55da2d4. 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 (55da2d4) vs base (fd04f77)

                                     testName |    base |   head |  change
--------------------------------------------------------------------------
                                      Sheet A |  498.02 | 491.85 |  -1.24%
                                      Sheet B |   157.2 | 154.76 |  -1.55%
                                      Sheet T |  140.44 | 141.26 |  +0.58%
                                Column ranges |  468.11 | 472.64 |  +0.97%
                                Sorted lookup | 14394.4 |  14381 |  -0.09%
Sheet A:  change value, add/remove row/column |   16.88 |  15.95 |  -5.51%
 Sheet B: change value, add/remove row/column |  143.14 | 126.27 | -11.79%
                   Column ranges - add column |  149.56 | 148.06 |  -1.00%
                Column ranges - without batch |  476.73 | 444.26 |  -6.81%
                        Column ranges - batch |  116.36 | 113.22 |  -2.70%

[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 (55da2d4).

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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