chore: remove unused files (#540)

### Relocated logo file and removed unnecessary configuration files.

### What changed?

- Moved `logo.svg` to `apps/web/public/logo-fullmark.svg`
- Updated the logo path in `README.md` to reflect the new location
- Removed empty `.npmrc` file
- Removed `apps/web/public/_headers` file that contained Next.js static caching configuration

README.md

@@ -1,5 +1,5 @@
 <div align="center" style="padding-bottom:20px;padding-top:20px">
-  <img src="logo.svg" alt="supermemory Logo" width="400" />
+  <img src="apps/web/public/logo-fullmark.svg" alt="supermemory Logo" width="400" />
 </div>
 
 <div align="center" style="padding-bottom:10px;padding-top:10px">

apps/web/public/_headers

@@ -1,2 +0,0 @@
-/_next/static/*
-  Cache-Control: public,max-age=31536000,immutable