fix: restore docs accidentally deleted in PR #4001 (electron-vite refactor) - #4196

…vite refactor) (marktext#4196)

* fix: restore docs accidentally deleted in PR marktext#4001 (electron-vite refactor)

Restore 7 files that were unintentionally removed during the electron-vite
refactoring, which had no functional relation to the build system changes:

- .github/CHANGELOG.md        (858 lines, project history)
- .github/CODE_OF_CONDUCT.md  (74 lines, community guidelines)
- .github/PULL_REQUEST_TEMPLATE.md (16 lines, PR template)
- CONTRIBUTING.md             (92 lines, contribution guide)
- docs/README.md              (29 lines, user docs index)
- docs/dev/RELEASE_HOTFIX.md  (14 lines, hotfix release process)
- docs/i18n/tr.md             (265 lines, Turkish README, had no replacement)

Not restored: old i18n files replaced by renamed equivalents (README-fr.md
etc.), docs/i18n/pl.md (self-described as outdated since 2018), and test
data .md files whose entire test infrastructure was intentionally removed.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

* refactor(docs): move user documentation into docs/end-user/

Move all 20 end-user-facing markdown files from docs/ into the new
docs/end-user/ subdirectory to separate them from developer docs,
i18n files, and static assets.

Update all affected links:
- docs/README.md: all local doc links now prefixed with end-user/
- docs/end-user/{BASICS,EDITING,EXPORT,SPELLING}.md: assets/ → ../assets/
- docs/end-user/THEMES.md: themeImages/ → ../themeImages/
- docs/i18n/README-{de,es,fr,jp,kr,pt,zh_cn,zh_tw}.md: ../THEMES.md → ../end-user/THEMES.md
- docs/i18n/tr.md: ../LINUX.md → ../end-user/LINUX.md
- docs/i18n/ar.md: ../../docs/LINUX.md → ../../docs/end-user/LINUX.md
- README.md: docs/THEMES.md → docs/end-user/THEMES.md

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

* chore(github): modernize issue and PR templates

Issue templates:
- Remove legacy single-file ISSUE_TEMPLATE.md (superseded by directory)
- Replace bug_report.md with structured Issue Form (bug_report.yml):
  required fields, OS dropdown, version inputs, reproducibility checkbox,
  auto-labels: bug + triage
- Improve feature_request.md: add title prefix "[Feature] ", label
  "enhancement", restructure sections (Summary / Problem / Proposed
  solution / Alternatives / Context)
- Remove question.md; questions now routed to GitHub Discussions
- Add config.yml: blank_issues_enabled=false, contact_links to
  Discussions and Documentation

PR template:
- Replace Q&A table with "Closes #" link + type checklist + test plan
- Add "Notes for reviewers" section
- Retain MIT license acknowledgement

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

* refactor(docs): reorganize CODE_OF_CONDUCT, CHANGELOG and consolidate images

Move files:
- .github/CODE_OF_CONDUCT.md → docs/dev/CODE_OF_CONDUCT.md
- .github/CHANGELOG.md       → docs/CHANGELOG.md
- docs/{brew-cask.gif,doutu.jpg,focus.gif,marktext.png,source.gif,typewriter.gif}
                             → docs/assets/
- docs/dev/assets/marktext-interface.png → docs/assets/

Update all affected references (13 files):
- README.md: 4 image paths
- docs/i18n/README-{de,es,fr,jp,kr,pt,zh_cn,zh_tw}.md: 4 image paths each
- docs/i18n/tr.md: 4 image paths + CHANGELOG link
- docs/i18n/ar.md: 4 image paths + CHANGELOG link
- docs/dev/INTERFACE.md: marktext-interface.png path
- CONTRIBUTING.md: CODE_OF_CONDUCT.md link

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

* revert: restore root README.md to master branch version

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

* fix: correct broken links in README.md

* chore: miscellaneous file reorganization

- Move CONTRIBUTING.md → .github/CONTRIBUTING.md
- Rename docs/i18n/ar.md → docs/i18n/README-ar.md
- Rename docs/i18n/tr.md → docs/i18n/README-tr.md
- Remove docs/sponsor/ images (qordoba.png, readme.png)
- Update docs/end-user/BASICS.md and LINUX.md

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

* fix: restore .github/FUNDING.yml from master

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

* feat(i18n): re-translate all README files from root README.md source

* chore: misc dev docs and config updates

- Update .vscode/settings.json
- Update docs/dev/ARCHITECTURE.md
- Move docs/dev/code/IPC.md → docs/dev/IPC.md
- Remove docs/dev/code/ directory (BLOCK_ADDITION_PROPERTY.md, COMMANDS.md, IPC.md, README.md, renderer/editor.md)
- Remove docs/i18n-validation.md
- Update package.json

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

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Co-authored-by: Claude Sonnet 4.6 <[email protected]>