Don't guard images behing auth

You can't just add headers to clientside image requests without
basically manually fetching and drawing it to a canvas,
and the UUIDs are random enough that they won't be brute forced.
So, for vastly more simple client code, remove the auth guard.

src/images.controller.ts

-import {
-    Controller,
-    Get,
-    Header,
-    HttpCode,
-    Param,
-    Res,
-    UseGuards,
-} from '@nestjs/common';
+import { Controller, Get, Param, Res } from '@nestjs/common';
 import { Response } from 'express';
 import { join } from 'path';
-import { WebAuthGuard } from './auth/web-auth.guard';
 
 @Controller('images')
-@UseGuards(WebAuthGuard)
 export class ImageController {
     @Get(':id')
     public image(@Param('id') id: string, @Res() res: Response) {
-        res.sendFile(join(process.cwd(), 'photos', `${id}.jpg`));
+        res.sendFile(
+            join(process.cwd(), 'photos', `${id.replace(/\.jpg$/, '')}.jpg`),
+        );
     }
 }