Remove Josh as maintainer (#928)

Co-authored-by: Joshua Teves <joshua.teves@nih.gov>
Co-authored-by: Dan Handwerker <7406227+handwerkerd@users.noreply.github.com>

docs/contributing.rst

@@ -543,8 +543,6 @@ Maintainer
   +-------------------------------------------+
   | `Taylor Salo`_ (@tsalo)                   |
   +-------------------------------------------+
-  | `Joshua Teves`_ (@jbteves)                |
-  +-------------------------------------------+
   | `Eneko Uruñuela`_ (@eurunuela)            |
   +-------------------------------------------+
 
@@ -563,8 +561,6 @@ Steering committee
   +--------------------------------------+
   | `Taylor Salo`_ (@tsalo)              |
   +--------------------------------------+
-  | `Joshua Teves`_ (@jbteves)           |
-  +--------------------------------------+
   | `Eneko Uruñuela`_ (@eurunuela)       |
   +--------------------------------------+
 
@@ -597,12 +593,9 @@ Focused Leadership Roles
         implementation is good)
     |   Someone who can either answer processing algorithm questions or
         direct people to where they can find answers
-  - | Collaborative programming leaders: `Elizabeth DuPre`_ & `Joshua Teves`_
+  - | Collaborative programming leaders: `Elizabeth DuPre`_
     |   Helps make sure tedana is following best practices for Python code
         design, testing, and communication for issues/pull requests etc.
-  - | Communications leader: `Joshua Teves`_
-    |   Mailing list manager & other outward-facing communication about
-        the project
   - | New contributors leader: `Taylor Salo`_
     |   Leads efforts to make contributor documentation more welcoming
     |   Is a point of contact for potential contributors to make them feel