chore: adopt remote dprint config, tidy examples

Extend dprint from a shared remote config and add the prettier
and exec plugins, formatting TOML via a new tombi.toml instead
of golangci-lint fmt. Taskfile.yml, scripts/build.sh, and
html_styles.css pick up the resulting reformat.

Exporter examples now write to a temp dir and clean up after
themselves instead of leaving output.md/.docx/.html in the
repo. Drop the stray internal/exporters/output.docx and ignore
internal/exporters/output.* going forward.

tombi.toml

@@ -0,0 +1,49 @@
+# :schema tombi://www.schemastore.org/tombi.json
+# :tombi toml-version = "v1.1.0"
+
+toml-version = "v1.1.0"
+
+[files]
+include = ["**/*.toml", "**/.*.toml"]
+exclude = ["**/fixtures"]
+
+[format]
+[format.rules]
+array-bracket-space-width         = 0
+array-comma-space-width           = 1
+date-time-delimiter               = "T"
+indent-style                      = "space"
+indent-sub-tables                 = false
+indent-table-key-value-pairs      = false
+indent-width                      = 2
+inline-table-brace-space-width    = 1
+inline-table-comma-space-width    = 1
+key-value-equals-sign-alignment   = true
+key-value-equals-sign-space-width = 1
+line-ending                       = "lf"
+line-width                        = 140
+string-quote-style                = "double"
+trailing-comment-alignment        = true
+trailing-comment-space-width      = 2
+
+[lint]
+[lint.rules]
+dotted-keys-out-of-order = "warn"
+key-empty                = "warn"
+tables-out-of-order      = "error"
+
+[lsp]
+code-action.enabled          = true
+completion.enabled           = true
+diagnostic.enabled           = true
+document-link.enabled        = true
+formatting.enabled           = true
+goto-declaration.enabled     = true
+goto-definition.enabled      = true
+goto-type-definition.enabled = true
+hover.enabled                = true
+workspace-diagnostic.enabled = true
+
+[schema]
+enabled = true
+strict  = true