Fix Typos

[KCarretto]

This PR fixes several spelling errors and typos across the codebase.

Changes include:

• AGENTS.md: "reuseable" -> "reusable"
• README.md, docs/README.md, docs/_docs/user-guide/golem.md, docs/_includes/editable.html, docs/pages/index.md: "Github" -> "GitHub"
• tavern/internal/www/src/pages/tomes/import-modal/StepAddDeploymentKey.tsx: "Github" -> "GitHub", "Gitlab" -> "GitLab"
• tavern/cli/auth/auth.go, tavern/internal/redirectors/http1/grpc_stream_test.go, tavern/internal/portals/mux/benchmark_test.go: "cancelled" -> "canceled"
• tavern/internal/auth/oauth_test.go, tavern/internal/errors/http_test.go, tavern/config.go: "behaviour" -> "behavior"

Ran go fmt ./tavern/... which also formatted:

• tavern/internal/redirectors/tls.go
• tavern/internal/cdn/download_link.go
• tavern/internal/ent/schema/link_test.go

Ran go test ./tavern/... and tests passed.
Rebuilt frontend to update artifacts in tavern/internal/www/build.

---

PR created automatically by Jules for task 7889468545859451867 started by @KCarretto

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[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
2557    ±0	2557    ±0	0    ±0	0    ±0	0    ±0	0    ±0	1ms    ±0

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#975	✅	2557	2557	0	0	0	0	31.0s

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
2557	0	0	5.2s

Slowest Tests

Test 📝	Results 📊	Duration (avg) ⏱️	Duration (p95) ⏱️
eldritch-libsys: std::dll_inject_impl::tests::test_dll_inject_simple	1	5.2s	5.2s
imix::bin/imix: install::tests::test_install_execution	3	1.1s	3.3s
imix::bin/imix: install::tests::test_install_execution	3	1.1s	3.3s
imix::bin/imix: install::tests::test_install_execution	3	1.1s	3.3s
imix::bin/imix: tests::task_tests::test_task_streaming_output	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_output	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_output	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_error	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_error	3	3.0s	3.0s
imix::bin/imix: tests::task_tests::test_task_streaming_error	3	3.0s	3.0s

_{🎉 No failed tests in this run. | 🍂 No flaky tests in this run.}

Github Test Reporter by CTRF 💚