[Docs] Add spellchecking with pyenchant

- Use sphinxcontrib.spelling with custom wordlist.
- Skip the checking of the modules documents as they raise
false-positives.
- Add a setup.py spellcheck_docs command.
- Fix spelling and other issues.
- Add a doc favicon.

docs/source/devguide/how-to/curl-jsonrpc.md

@@ -1,8 +1,8 @@
 # How to connect to JSON-RPC with curl
 
-Before continuing make sure deluge-web or webui plugin is running.
+Before continuing make sure `deluge-web` or Web UI plugin is running.
 
-## Create a curl config
+## Create a curl configuration file
 
 To save a lot of typing and to keep the curl command short we shall create
 a `curl.cfg` files and put the following contents in it:
@@ -16,11 +16,11 @@ a `curl.cfg` files and put the following contents in it:
     url = "http://localhost:8112/json"
     write-out = "\n"
 
-To pretty-print the JSON result see: https://stackoverflow.com/q/352098/175584
+To pretty-print the JSON result see: <https://stackoverflow.com/q/352098/175584>
 
-## Login to WebUI
+## Login to Web UI
 
-Login to the WebUI and get session cookie:
+Login to the Web UI and get session cookie:
 
     curl -d '{"method": "auth.login", "params": ["deluge"], "id": 1}' -K curl.cfg
 
@@ -43,12 +43,12 @@ Check the contents of the cookie file to verify session ID created.
 
 ## Check connected to deluged
 
-Use the `web.connected` method to get a boolean response if the webui is
+Use the `web.connected` method to get a boolean response if the Web UI is
 connected to a deluged host:
 
     curl -d '{"method": "web.connected", "params": [], "id": 1}' -K curl.cfg
 
-Result is `false` because WebUI is not yet connected to the daemon:
+Result is `false` because Web UI is not yet connected to the daemon:
 
     {
         "error": null,
@@ -101,7 +101,7 @@ To connect to deluged with `<hostID>`:
     curl -d '{"method": "web.connect", \
     "params": ["<hostID>"], "id": 1}' -K curl.cfg
 
-The result contains the full list of avaiable host methods:
+The result contains the full list of available host methods:
 
     {
         "error": null,
@@ -148,7 +148,7 @@ A successful result:
 
     {"error": null, "result": null, "id": 1}
 
-## Useful curl config options
+## Useful curl configuration options
 
 For full list of options see man page `man curl` or help `curl --help`:
 

docs/source/devguide/how-to/update-1.3-plugin.md

@@ -27,7 +27,7 @@ Use [six] to assist with compatibility.
 
 ### Unicode literals
 
-Add the following to files to ensure strings and bytes separatation so there
+Add the following to files to ensure strings and bytes separation so there
 are no surprises when running on Python 3.
 
     from __future__ import unicode_literals
@@ -49,7 +49,7 @@ GtkBuilder `.ui` files and the Python code updated.
 
 See the official [Migrating to GtkBuilder][migrate-gtkbuilder] document for more details.
 
-#### gtk-builder-convert
+#### GtkBuilder conversion script
 
 Install the `gtk-builder-convert` converter on Ubuntu with:
 
@@ -103,7 +103,7 @@ If you open and save the file it will update with the new requirement header:
       <requires lib="gtk+" version="3.10"/>
 
 You can fix deprecated widgets but keep the minimum GTK version to <= 3.10 for
-desktop compatiblity.
+desktop compatibility.
 
 An example of migrating a Deluge plugin to GtkBuilder: [AutoAdd GtkBuilder]
 
@@ -111,7 +111,7 @@ An example of migrating a Deluge plugin to GtkBuilder: [AutoAdd GtkBuilder]
 
 Move from PyGTK to GTK3 using Python bindings.
 
-https://pygobject.readthedocs.io/en/latest/guide/porting.html
+<https://pygobject.readthedocs.io/en/latest/guide/porting.html>
 
     wget https://gitlab.gnome.org/GNOME/pygobject/raw/master/tools/pygi-convert.sh
     cp gtkui.py gtk3ui.py