Add mathematical documents on integration techniques and series expansions

- Created a new document for the ILATE rule in integration by parts, explaining its application and significance.
- Updated the integration by parts document with aliases, links, and a more structured introduction.
- Added a new document detailing the Wallis product and its derivation from Wallis integrals, including definitions and proofs.
- Removed redundant content related to the Wallis formula to streamline information.
- Introduced a new document on the first substitution method for integration, outlining its principles and providing examples.
- Added a document on Taylor series, explaining its definition, properties, and common expansions.
- Created a new document for function series, discussing its general concept and relation to Taylor series.

Author: Cyletix

.obsidian/appearance.json

@@ -2,8 +2,9 @@
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.obsidian/community-plugins.json

@@ -8,5 +8,5 @@
   "obsidian-matrix",
   "obsidian-tikzjax",
   "quickadd",
-  "obsidian-git"
+  "callout-integrator"
 ]

.obsidian/hotkeys.json

@@ -178,5 +178,23 @@
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.obsidian/snippets/hide-embed-props.css

@@ -0,0 +1,20 @@
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