readme: Updates and typo fixes

README.md

@@ -11,6 +11,8 @@ are the exceptions:
 - `github.com/gorilla/sessions` for session management.
 - `go.etcd.io/bbolt` is our database driver.
 - `github.com/pkg/errors` provides a [`Wrap`] function.
+- `github.com/prometheus/client_golang/prometheus/...` has easy Prometheus
+  functionality.
 
 [`Wrap`]: https://godoc.org/github.com/pkg/errors#Wrap
 
@@ -29,18 +31,32 @@ That means that we have to separate every other page with some kind of
 namespace. Ideas:
 
 - `/z/` reserved for flat pages.
-- `/p/` reserved for "pastes".
-- `/u/` reserved for "users".
-- `/f/` reserved for "files".
 - `/z/static/` reserved for "static files".
 
+## Paste types
+
+Previous, I was planning to put pastes (not redirects) in a separate bucket
+and below a url namespace. Then when one was created, we would immediately
+generate a redirect link.
+
+Turns out it's easier though to just save a unit (we call it a "paste") which
+can be of different types. For example:
+
+- Redirect
+- Paste
+- File
+- Image
+- Hypothetical other stuff:
+    - Dead-drop
+    - [...]?
+
 ## Shorten keys and collisions
 
-First of all: A sexted is a value of 6 bits.
+First of all: A sextet is a value of 6 bits.
 
 For generating keys, we will initially generate a random value of 4 sextets,
 where the first bit is set to `0`. If this collides with an existing key, we
-will generate a new one made out of 5 sextexts, and set the prefix bits to
+will generate a new one made out of 5 sextets, and set the prefix bits to
 `0b10`. We will keep doing this until we don't have any collisions anymore.
 
 To get proper-looking keys, we format the key to characters using the
@@ -72,10 +88,10 @@ header that the client sends. We can still wrap the plain-text page in a single
   forever, and store a user's data in there, without having to collect personal
   data in any way.
 - URL-shortening links will be retained for always, unless the submitter
-  revokes it, in which case it will be replaced by a `410 Gone` page*.
-- The probles of pastes are not solved. This is an unsolved problem*.
+  revokes it, in which case it will be replaced by a `410 Gone` page[*].
+- The probles of pastes are not solved. This is an unsolved problem[*].
 
-* In any case, we going to comply with all European laws and reasonable
+[*] In any case, we going to comply with all European laws and reasonable
   requests for deletion.
 
 ## Privacy