Tweak labeler config (#27502)

Alternative to https://github.com/go-gitea/gitea/pull/27439. Removes a
few spammy labels, and disables `sync-labels` which make it never remove
labels (which is default behaviour).

.github/labeler.yml

@@ -6,10 +6,6 @@ kind/ui:
   - "web_src/**/*"
   - all: ["templates/**", "!templates/swagger/v1_json.tmpl"]
 
-kind/api:
-  - "templates/swagger/v1_json.tmpl"
-  - "routers/api/**"
-
 kind/build:
   - "Makefile"
   - "Dockerfile"
@@ -17,15 +13,6 @@ kind/build:
   - "docker/**"
   - "webpack.config.js"
 
-theme/package-registry:
-  - "modules/packages/**"
-  - "services/packages/**"
-  - "routers/api/packages/**"
-  - "routers/web/shared/packages/**"
-
-kind/cli:
-  - "cmd/**"
-
 kind/lint:
   - ".eslintrc.yaml"
   - ".golangci.yml"

.github/workflows/pull-labeler.yml

@@ -18,4 +18,3 @@ jobs:
       - uses: actions/labeler@v4
         with:
           dot: true
-          sync-labels: true