Fix for https://github.com/SpaceVim/SpaceVim/issues/2301. (#2303)

Updated for  remove username  in github layer & doc.

autoload/SpaceVim/layers/github.vim

@@ -47,7 +47,8 @@ function! SpaceVim#layers#github#config() abort
   let g:_spacevim_mappings_space.g.g = { 'name': '+Gist' }
 
   " @todo remove the username
-  call SpaceVim#mapping#space#def('nnoremap', ['g', 'g', 'l'], 'Gista list -u wsdjeg',
+  " autoload to set default username
+  call SpaceVim#mapping#space#def('nnoremap', ['g', 'g', 'l'], 'Gista list',
         \ 'list gist', 1)
   call SpaceVim#mapping#space#def('nnoremap', ['g', 'g', 'p'], 'Gista post',
         \ 'post selection or current file', 1, 1)

docs/layers/github.md

@@ -10,6 +10,7 @@ description: "This layer provides GitHub integration for SpaceVim"
 - [Description](#description)
 - [Install](#install)
 - [Key bindings](#key-bindings)
+- [Extra configuration for GitHub and Gist](#extra-configuration-for-github-and-gist)
 
 <!-- vim-markdown-toc -->
 
@@ -38,3 +39,20 @@ To use this configuration layer, add following snippet to your custom configurat
 | `SPC g h p` | show PRs in browser          |
 | `SPC g g l` | list all gist                |
 | `SPC g g p` | post gist                    |
+
+## Extra configuration for GitHub and Gist
+
+For avoid repeating input the account name and passwrod, you need to add the belowing contennt for auto .SpaceVim.d/autoload/myspacevim.vim [Bootstrap Functions](https://spacevim.org/documentation/#bootstrap-functions). 
+
+```vim
+func! myspacevim#before() abort
+  "other configs
+  let g:github_dashboard = { 'username': 'yourgithubuser', 'password': $GITHUB_TOKEN }
+  let g:gista#client#default_username = 'monkeyxite'
+endf
+```
+Refer [github dashboar](https://github.com/junegunn/vim-github-dashboard), for security concerns you could create a Personal Access Token, export it as an environment variable and use it as a password.
+```shell
+# in some secure file sourced in your .bashrc, .bash_profile, .zshrc, etc.
+export GITHUB_TOKEN="<your 40 char token>"
+```