formatting: standardize spacing between sections

README.md

@@ -124,6 +124,7 @@ See [Contributing](.github/CONTRIBUTING.md).
 _Related: [Personal Dashboards](#personal-dashboards)_
 
 
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 ### Archiving and Digital Preservation (DP)
 
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@@ -272,6 +273,7 @@ _Related: [Groupware](#groupware)_
 _See also: [Comparison of CalDAV and CardDAV implementations - Wikipedia](https://en.wikipedia.org/wiki/Comparison_of_CalDAV_and_CardDAV_implementations)_
 
 
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 ### Calendar & Contacts - CalDAV or CardDAV Servers
 
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@@ -308,6 +310,7 @@ _See also: [Comparison of CalDAV and CardDAV implementations - Wikipedia](https:
 [Communication software](https://en.wikipedia.org/wiki/Communication_software) used to provide remote access to systems and exchange files and messages in text, audio and/or video formats between different computers or users.
 
 
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 ### Communication - Custom Communication Systems
 
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@@ -371,6 +374,7 @@ Communication software using their own custom procols.
 [E-mail](https://en.wikipedia.org/wiki/Email) software.
 
 
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 ### Communication - Email - Complete Solutions
 
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@@ -599,6 +603,7 @@ _Related: [Conference Management](#conference-management)_
 [Extensible Messaging and Presence Protocol](https://en.wikipedia.org/wiki/XMPP) communication software.
 
 
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 ### Communication - XMPP - Servers
 
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@@ -839,6 +844,7 @@ _Related: [Community-Supported Agriculture (CSA)](#community-supported-agricultu
 **Please visit [awesome-sysadmin/Identity Management](https://github.com/awesome-foss/awesome-sysadmin#identity-management)**
 
 
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 ### Feed Readers
 
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@@ -876,7 +882,6 @@ A [news aggregator](https://en.wikipedia.org/wiki/News_aggregator), also termed
 - [ttrss-mobile](https://github.com/mboinet/ttrss-mobile) - Mobile webapp for Tiny Tiny RSS. `AGPL-3.0` `Javascript`
 
 
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 ### File Transfer & Synchronization
 
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@@ -911,6 +916,7 @@ Network distributed filesystems.
 **Please visit [awesome-sysadmin/Distributed Filesystems](https://github.com/awesome-foss/awesome-sysadmin#distributed-filesystems)**
 
 
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 ### File Transfer - Object Storage & File Servers
 
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@@ -1383,6 +1389,7 @@ _See also: [awesome-sysadmin/IT Asset Management](https://github.com/awesome-fos
 **Please visit [awesome-sysadmin/Monitoring](https://github.com/awesome-foss/awesome-sysadmin#monitoring), [awesome-sysadmin/Metric and Metric Collection](https://github.com/awesome-foss/awesome-sysadmin#metric--metric-collection)**
 
 
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 ### Note-taking & Editors
 
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@@ -1684,6 +1691,7 @@ _Related: [Booking and Scheduling](#booking-and-scheduling)_
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 ### Software Development - API Management
 
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@@ -1708,6 +1716,7 @@ _Related: [Booking and Scheduling](#booking-and-scheduling)_
 **Please visit [awesome-sysadmin/Continuous Integration & Continuous Deployment](https://github.com/awesome-foss/awesome-sysadmin#continuous-integration--continuous-deployment)**
 
 
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 ### Software Development - FaaS & Serverless
 
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@@ -1920,6 +1929,7 @@ Before hosting one, please see [shortcomings](https://en.wikipedia.org/wiki/URL_
 **Please visit [awesome-sysadmin/VPN](https://github.com/awesome-foss/awesome-sysadmin#vpn)**
 
 
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 ### Web Servers
 
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@@ -1927,6 +1937,7 @@ Before hosting one, please see [shortcomings](https://en.wikipedia.org/wiki/URL_
 **Please visit [awesome-sysadmin/Web](https://github.com/awesome-foss/awesome-sysadmin#web)**
 
 
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 ### Wikis
 
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@@ -1962,6 +1973,7 @@ _See also: [Wikimatrix](https://www.wikimatrix.org/), [Wiki Engines - WikiIndex]
 - [XWiki](https://www.xwiki.org) - Second generation wiki that allows the user to extend its functionalities with a powerful extension-based architecture. ([Demo](https://playground.xwiki.org), [Source Code](https://github.com/xwiki/xwiki-platform)) `LGPL-2.1` `Java`
 - [Zim](https://zim-wiki.org/) - Graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images. ([Source Code](https://github.com/zim-desktop-wiki/zim-desktop-wiki)) `GPL-2.0` `Python`
 
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 ## List of Licenses