fixed readme.md and userguide.md naviigation links style

Author: pjazdzyk

README.md

@@ -10,13 +10,7 @@
 
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-<span style="font-weight:700;font-size:15px">
-
-[USER GUIDE](USER_GUIDE.md) | [DESCRIPTION](#short-description) | [TECH](#tech) | [FUNCTIONALITY](#current-functionality) |
-[COLLABORATION](#collaboration) | [LEGAL DISCLAIMER](#legal-disclaimer) | [REFERENCE SOURCES](#reference-sources) |
-[ACKNOWLEDGMENTS](#acknowledgments)
-
-</span>
+#### [USER GUIDE](USER_GUIDE.md) | [DESCRIPTION](#short-description) | [TECH](#tech) | [FUNCTIONALITY](#current-functionality) | [COLLABORATION](#collaboration) | [LEGAL DISCLAIMER](#legal-disclaimer) | REFERENCE SOURCES](#reference-sources) | [ACKNOWLEDGMENTS](#acknowledgments)
 
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USER_GUIDE.md

@@ -6,11 +6,7 @@
 
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-<span style="font-weight:700;font-size:15px">
-
-[HOME](README.md) | [DUCT NETWORK MODEL](#duct-network-model) | [ROOM MODEL](#room-model) |  [USE EXAMPLE](#use-example)
-
-</span>
+#### [HOME](README.md) | [DUCT NETWORK MODEL](#duct-network-model) | [ROOM MODEL](#room-model) | [USE EXAMPLE](#use-example)
 
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