use tsx ext only when needed

diff --git a/src/server/handlers/robots-handler.tsx b/src/server/handlers/robots-handler.ts
similarity index 100%
rename from src/server/handlers/robots-handler.tsx
rename to src/server/handlers/robots-handler.ts

diff --git a/src/server/handlers/service-worker-handler.tsx b/src/server/handlers/service-worker-handler.ts
similarity index 100%
rename from src/server/handlers/service-worker-handler.tsx
rename to src/server/handlers/service-worker-handler.ts

diff --git a/src/server/handlers/theme-handler.tsx b/src/server/handlers/theme-handler.ts
similarity index 100%
rename from src/server/handlers/theme-handler.tsx
rename to src/server/handlers/theme-handler.ts

diff --git a/src/server/handlers/themes-list-handler.tsx b/src/server/handlers/themes-list-handler.ts
similarity index 100%
rename from src/server/handlers/themes-list-handler.tsx
rename to src/server/handlers/themes-list-handler.ts