Doc updates

.gitignore

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 *~
 *.sw[op]
+doc/screenshots/.DS_Store

doc/DESCRIPTION.md

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-Some long and extensive description of what the app is and does, lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+PhotoPrism® is an AI-Powered Photos App for the Decentralized Web. It makes use of the latest technologies to tag and find pictures automatically without getting in your way. You can run it at home, on a private server, or in the cloud.
 
 ### Features
 
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+- Browse all your photos and videos without worrying about RAW conversion, duplicates or video formats
+- Easily find specific pictures using powerful search filters
+- Includes four high-resolution world maps to bring back the memories of your favorite trips
+- Play Live Photos™ by hovering over them in albums and search results
+- Recognizes the faces of your family and friends
+- Automatic classification of pictures based on their content and location

doc/DISCLAIMER.md

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 * Any known limitations, constrains or stuff not working, such as (but not limited to):
-    * requiring a full dedicated domain ?
-    * architectures not supported ?
-    * not-working single-sign on or LDAP integration ?
-    * the app requires an important amount of RAM / disk / .. to install or to work properly
-    * etc...
+    * Not tested yet with AMD architecture
+    * Photoprism currently supports only one user. OIDC should be supported within a few months
+    * Photoprism requires an important amount of RAM and disk to install or to work properly
 
-* Other infos that people should be aware of, such as:
-    * any specific step to perform after installing (such as manually finishing the install, specific admin credentials, ...)
-    * how to configure / administrate the application if it ain't obvious
-    * upgrade process / specificities / things to be aware of ?
-    * security considerations ?
+* At first install, you'll be prompted for credentials
+    * Username is "admin"
+    * Password is the password you have set during the installation