doc: improve new contributor documentation & readme (#1467)

* fixes: #1465 
* fixes: #1317 
* fixes: #1446

Author: terriko

.github/actions/spelling/allow.txt

@@ -1,11 +1,3 @@
-refactoring
-peb
-conventionalcommits
-nisamson
-bhargavh
-jerinjtitus
-Molkree
-Romi
 abhaykatheria
 ableabhinav
 accountsservice
@@ -21,6 +13,7 @@ api
 apk
 Args
 asn
+asottile
 autoescape
 autoextract
 autoextracts
@@ -32,6 +25,7 @@ bcca
 bdbd
 bdist
 bestpractices
+bhargavh
 bigbird
 binutils
 bksahu
@@ -60,6 +54,7 @@ cmdline
 codecov
 conda
 config
+conventionalcommits
 copyleft
 coreinfrastructure
 cpio
@@ -90,6 +85,7 @@ distros
 dnsmasq
 docstring
 DOCTYPE
+downloading
 dpkg
 dsa
 dtls
@@ -157,6 +153,7 @@ INI
 irssi
 itertools
 javascript
+jerinjtitus
 jquery
 json
 Kamdar
@@ -194,6 +191,7 @@ libxml
 libxslt
 lifecycle
 lighttpd
+linting
 linux
 logrotate
 lua
@@ -211,6 +209,7 @@ metadata
 microsoft
 mkdir
 modulename
+Molkree
 mozilla
 msgid
 msgstr
@@ -226,6 +225,7 @@ netpbm
 nginx
 Niraj
 nirajkamdar
+nisamson
 nitishsaini
 nlk
 noopener
@@ -252,6 +252,7 @@ pcsc
 pdf
 pdftotext
 pdxjohnny
+peb
 php
 pigz
 plotly
@@ -272,6 +273,7 @@ pypi
 pytest
 pythex
 pythonapp
+pyupgrade
 Qqe
 queryformat
 quickstart
@@ -281,8 +283,9 @@ Rahul
 readme
 readthedocs
 realpython
-downloading
+refactoring
 regex
+Romi
 rossburton
 rpmfile
 rst
@@ -295,6 +298,7 @@ sbs
 sdk
 shreyamalviya
 somefile
+sottile
 SPDX
 sqlite
 src